diff --git a/include/internal/catch_interfaces_testcase.h b/include/internal/catch_interfaces_testcase.h
index 9e02b14f..f57cc8fe 100644
--- a/include/internal/catch_interfaces_testcase.h
+++ b/include/internal/catch_interfaces_testcase.h
@@ -9,7 +9,6 @@
 #define TWOBLUECUBES_CATCH_INTERFACES_TESTCASE_H_INCLUDED
 
 #include <vector>
-#include <memory>
 
 namespace Catch {
 
@@ -20,8 +19,6 @@ namespace Catch {
         virtual ~ITestInvoker();
     };
 
-    using ITestCasePtr = std::shared_ptr<ITestInvoker>;
-
     class TestCase;
     struct IConfig;
 
diff --git a/include/internal/catch_stringref.h b/include/internal/catch_stringref.h
index 05206b0b..64f595b3 100644
--- a/include/internal/catch_stringref.h
+++ b/include/internal/catch_stringref.h
@@ -13,8 +13,6 @@
 
 namespace Catch {
 
-    class StringData;
-
     /// A non-owning string class (similar to the forthcoming std::string_view)
     /// Note that, because a StringRef may be a substring of another string,
     /// it may not be null terminated. c_str() must return a null terminated