diff --git a/CMakeLists.txt b/CMakeLists.txt
index a0751b18..e3ea7ca1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -159,7 +159,6 @@ set(INTERNAL_HEADERS
         ${HEADER_DIR}/internal/catch_session.h
         ${HEADER_DIR}/internal/catch_startup_exception_registry.h
         ${HEADER_DIR}/internal/catch_stream.h
-        ${HEADER_DIR}/internal/catch_streambuf.h
         ${HEADER_DIR}/internal/catch_stringref.h
         ${HEADER_DIR}/internal/catch_string_manip.h
         ${HEADER_DIR}/internal/catch_suppress_warnings.h
@@ -220,7 +219,6 @@ set(IMPL_SOURCES
         ${HEADER_DIR}/internal/catch_session.cpp
         ${HEADER_DIR}/internal/catch_startup_exception_registry.cpp
         ${HEADER_DIR}/internal/catch_stream.cpp
-        ${HEADER_DIR}/internal/catch_streambuf.cpp
         ${HEADER_DIR}/internal/catch_stringref.cpp
         ${HEADER_DIR}/internal/catch_string_manip.cpp
         ${HEADER_DIR}/internal/catch_tag_alias.cpp
diff --git a/include/internal/catch_config.cpp b/include/internal/catch_config.cpp
index 0f79a9ad..67d2b270 100644
--- a/include/internal/catch_config.cpp
+++ b/include/internal/catch_config.cpp
@@ -7,7 +7,7 @@
 
 #include "catch_config.hpp"
 #include "catch_enforce.h"
-#include "catch_stream.h"
+#include "catch_stringref.h"
 
 namespace Catch {
 
@@ -58,16 +58,7 @@ namespace Catch {
     Verbosity Config::verbosity() const                { return m_data.verbosity; }
 
     IStream const* Config::openStream() {
-        if( m_data.outputFilename.empty() )
-            return new CoutStream();
-        else if( m_data.outputFilename[0] == '%' ) {
-            if( m_data.outputFilename == "%debug" )
-                return new DebugOutStream();
-            else
-                CATCH_ERROR( "Unrecognised stream: '" << m_data.outputFilename << "'" );
-        }
-        else
-            return new FileStream( m_data.outputFilename );
+        return Catch::makeStream(m_data.outputFilename);
     }
 
 } // end namespace Catch
diff --git a/include/internal/catch_debugger.cpp b/include/internal/catch_debugger.cpp
index c1ef340c..71dc6506 100644
--- a/include/internal/catch_debugger.cpp
+++ b/include/internal/catch_debugger.cpp
@@ -14,13 +14,15 @@
 
 #ifdef CATCH_PLATFORM_MAC
 
-    #include <assert.h>
-    #include <stdbool.h>
-    #include <sys/types.h>
-    #include <unistd.h>
-    #include <sys/sysctl.h>
+#  include <assert.h>
+#  include <stdbool.h>
+#  include <sys/types.h>
+#  include <unistd.h>
+#  include <sys/sysctl.h>
+#  include <cstddef>
+#  include <ostream>
 
-    namespace Catch {
+namespace Catch {
 
         // The following function is taken directly from the following technical note:
         // http://developer.apple.com/library/mac/#qa/qa2004/qa1361.html
diff --git a/include/internal/catch_decomposer.h b/include/internal/catch_decomposer.h
index 38b62f45..25824c78 100644
--- a/include/internal/catch_decomposer.h
+++ b/include/internal/catch_decomposer.h
@@ -11,7 +11,7 @@
 #include "catch_tostring.h"
 #include "catch_stringref.h"
 
-#include <ostream>
+#include <iosfwd>
 
 #ifdef _MSC_VER
 #pragma warning(push)
diff --git a/include/internal/catch_stream.cpp b/include/internal/catch_stream.cpp
index 73889ce8..9d4a3de2 100644
--- a/include/internal/catch_stream.cpp
+++ b/include/internal/catch_stream.cpp
@@ -11,88 +11,129 @@
 #include "catch_enforce.h"
 #include "catch_stream.h"
 #include "catch_debug_console.h"
+#include "catch_stringref.h"
 
 #include <stdexcept>
 #include <cstdio>
 #include <iostream>
+#include <fstream>
 
 namespace Catch {
 
-    template<typename WriterF, std::size_t bufferSize=256>
-    class StreamBufImpl : public StreamBufBase {
-        char data[bufferSize];
-        WriterF m_writer;
+    Catch::IStream::~IStream() = default;
 
-    public:
-        StreamBufImpl() {
-            setp( data, data + sizeof(data) );
-        }
+    namespace detail { namespace {
+        template<typename WriterF, std::size_t bufferSize=256>
+        class StreamBufImpl : public std::streambuf {
+            char data[bufferSize];
+            WriterF m_writer;
 
-        ~StreamBufImpl() noexcept {
-            StreamBufImpl::sync();
-        }
-
-    private:
-        int overflow( int c ) override {
-            sync();
-
-            if( c != EOF ) {
-                if( pbase() == epptr() )
-                    m_writer( std::string( 1, static_cast<char>( c ) ) );
-                else
-                    sputc( static_cast<char>( c ) );
+        public:
+            StreamBufImpl() {
+                setp( data, data + sizeof(data) );
             }
-            return 0;
-        }
 
-        int sync() override {
-            if( pbase() != pptr() ) {
-                m_writer( std::string( pbase(), static_cast<std::string::size_type>( pptr() - pbase() ) ) );
-                setp( pbase(), epptr() );
+            ~StreamBufImpl() noexcept {
+                StreamBufImpl::sync();
             }
-            return 0;
-        }
-    };
+
+        private:
+            int overflow( int c ) override {
+                sync();
+
+                if( c != EOF ) {
+                    if( pbase() == epptr() )
+                        m_writer( std::string( 1, static_cast<char>( c ) ) );
+                    else
+                        sputc( static_cast<char>( c ) );
+                }
+                return 0;
+            }
+
+            int sync() override {
+                if( pbase() != pptr() ) {
+                    m_writer( std::string( pbase(), static_cast<std::string::size_type>( pptr() - pbase() ) ) );
+                    setp( pbase(), epptr() );
+                }
+                return 0;
+            }
+        };
+
+        ///////////////////////////////////////////////////////////////////////////
+
+        struct OutputDebugWriter {
+
+            void operator()( std::string const&str ) {
+                writeToDebugConsole( str );
+            }
+        };
+
+        ///////////////////////////////////////////////////////////////////////////
+
+        class FileStream : public IStream {
+            mutable std::ofstream m_ofs;
+        public:
+            FileStream( StringRef filename ) {
+                m_ofs.open( filename.c_str() );
+                CATCH_ENFORCE( !m_ofs.fail(), "Unable to open file: '" << filename << "'" );
+            }
+            ~FileStream() override = default;
+        public: // IStream
+            std::ostream& stream() const override {
+                return m_ofs;
+            }
+        };
+
+        ///////////////////////////////////////////////////////////////////////////
+
+        class CoutStream : public IStream {
+            mutable std::ostream m_os;
+        public:
+            // Store the streambuf from cout up-front because
+            // cout may get redirected when running tests
+            CoutStream() : m_os( Catch::cout().rdbuf() ) {}
+            ~CoutStream() override = default;
+
+        public: // IStream
+            std::ostream& stream() const override { return m_os; }
+        };
+
+        ///////////////////////////////////////////////////////////////////////////
+
+        class DebugOutStream : public IStream {
+            std::unique_ptr<StreamBufImpl<OutputDebugWriter>> m_streamBuf;
+            mutable std::ostream m_os;
+        public:
+            DebugOutStream()
+            :   m_streamBuf( new StreamBufImpl<OutputDebugWriter>() ),
+                m_os( m_streamBuf.get() )
+            {}
+
+            ~DebugOutStream() override = default;
+
+        public: // IStream
+            std::ostream& stream() const override { return m_os; }
+        };
+
+    }} // namespace anon::detail
 
     ///////////////////////////////////////////////////////////////////////////
 
-
-    Catch::IStream::~IStream() = default;
-
-    FileStream::FileStream( std::string const& filename ) {
-        m_ofs.open( filename.c_str() );
-        CATCH_ENFORCE( !m_ofs.fail(), "Unable to open file: '" << filename << "'" );
-    }
-
-    std::ostream& FileStream::stream() const {
-        return m_ofs;
-    }
-
-    struct OutputDebugWriter {
-
-        void operator()( std::string const&str ) {
-            writeToDebugConsole( str );
+    auto makeStream( StringRef const &filename ) -> IStream const* {
+        if( filename.empty() )
+            return new detail::CoutStream();
+        else if( filename[0] == '%' ) {
+            if( filename == "%debug" )
+                return new detail::DebugOutStream();
+            else
+                CATCH_ERROR( "Unrecognised stream: '" << filename << "'" );
         }
-    };
-
-    DebugOutStream::DebugOutStream()
-    :   m_streamBuf( new StreamBufImpl<OutputDebugWriter>() ),
-        m_os( m_streamBuf.get() )
-    {}
-
-    std::ostream& DebugOutStream::stream() const {
-        return m_os;
+        else
+            return new detail::FileStream( filename );
     }
 
-    // Store the streambuf from cout up-front because
-    // cout may get redirected when running tests
-    CoutStream::CoutStream()
-    :   m_os( Catch::cout().rdbuf() )
-    {}
+    ///////////////////////////////////////////////////////////////////////////
 
-    std::ostream& CoutStream::stream() const {
-        return m_os;
-    }
 
 #ifndef CATCH_CONFIG_NOSTDOUT // If you #define this you must implement these functions
     std::ostream& cout() {
diff --git a/include/internal/catch_stream.h b/include/internal/catch_stream.h
index 41780b98..92136199 100644
--- a/include/internal/catch_stream.h
+++ b/include/internal/catch_stream.h
@@ -9,12 +9,7 @@
 #ifndef TWOBLUECUBES_CATCH_STREAM_H_INCLUDED
 #define TWOBLUECUBES_CATCH_STREAM_H_INCLUDED
 
-#include "catch_streambuf.h"
-
-#include <streambuf>
-#include <ostream>
-#include <fstream>
-#include <memory>
+#include <iosfwd>
 
 namespace Catch {
 
@@ -22,43 +17,14 @@ namespace Catch {
     std::ostream& cerr();
     std::ostream& clog();
 
+    class StringRef;
 
     struct IStream {
         virtual ~IStream();
         virtual std::ostream& stream() const = 0;
     };
 
-    class FileStream : public IStream {
-        mutable std::ofstream m_ofs;
-    public:
-        FileStream( std::string const& filename );
-        ~FileStream() override = default;
-    public: // IStream
-        std::ostream& stream() const override;
-    };
-
-
-    class CoutStream : public IStream {
-        mutable std::ostream m_os;
-    public:
-        CoutStream();
-        ~CoutStream() override = default;
-
-    public: // IStream
-        std::ostream& stream() const override;
-    };
-
-
-    class DebugOutStream : public IStream {
-        std::unique_ptr<StreamBufBase> m_streamBuf;
-        mutable std::ostream m_os;
-    public:
-        DebugOutStream();
-        ~DebugOutStream() override = default;
-
-    public: // IStream
-        std::ostream& stream() const override;
-    };
+    auto makeStream( StringRef const &filename ) -> IStream const*;
 }
 
 #endif // TWOBLUECUBES_CATCH_STREAM_H_INCLUDED
diff --git a/include/internal/catch_streambuf.cpp b/include/internal/catch_streambuf.cpp
deleted file mode 100644
index 608917fb..00000000
--- a/include/internal/catch_streambuf.cpp
+++ /dev/null
@@ -1,12 +0,0 @@
-/*
- *  Created by Martin on 31/08/2017.
- *
- *  Distributed under the Boost Software License, Version 1.0. (See accompanying
- *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- */
-
-#include "catch_streambuf.h"
-
-namespace Catch {
-    StreamBufBase::~StreamBufBase() = default;
-}
diff --git a/include/internal/catch_streambuf.h b/include/internal/catch_streambuf.h
deleted file mode 100644
index 18b94ccb..00000000
--- a/include/internal/catch_streambuf.h
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- *  Created by Phil on 27/11/2012.
- *  Copyright 2012 Two Blue Cubes Ltd. All rights reserved.
- *
- *  Distributed under the Boost Software License, Version 1.0. (See accompanying
- *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- */
-#ifndef TWOBLUECUBES_CATCH_STREAMBUF_H_INCLUDED
-#define TWOBLUECUBES_CATCH_STREAMBUF_H_INCLUDED
-
-#include <streambuf>
-
-namespace Catch {
-
-    class StreamBufBase : public std::streambuf {
-    public:
-        virtual ~StreamBufBase();
-    };
-}
-
-#endif // TWOBLUECUBES_CATCH_STREAMBUF_H_INCLUDED
diff --git a/projects/XCode/OCTest/catch_objc_impl.mm b/projects/XCode/OCTest/catch_objc_impl.mm
index 5b081ad7..01443cc9 100644
--- a/projects/XCode/OCTest/catch_objc_impl.mm
+++ b/projects/XCode/OCTest/catch_objc_impl.mm
@@ -39,7 +39,6 @@
 #include "../../../include/internal/catch_session.cpp"
 #include "../../../include/internal/catch_startup_exception_registry.cpp"
 #include "../../../include/internal/catch_stream.cpp"
-#include "../../../include/internal/catch_streambuf.cpp"
 #include "../../../include/internal/catch_string_manip.cpp"
 #include "../../../include/internal/catch_stringref.cpp"
 #include "../../../include/internal/catch_tag_alias.cpp"