diff --git a/src/catch2/internal/catch_assertion_handler.cpp b/src/catch2/internal/catch_assertion_handler.cpp
index e21294d5..14036062 100644
--- a/src/catch2/internal/catch_assertion_handler.cpp
+++ b/src/catch2/internal/catch_assertion_handler.cpp
@@ -26,12 +26,6 @@ namespace Catch {
         }
     }
 
-    LazyExpression::LazyExpression( bool isNegated )
-    :   m_isNegated( isNegated )
-    {}
-
-    LazyExpression::LazyExpression( LazyExpression const& other ) : m_isNegated( other.m_isNegated ) {}
-
     auto operator << ( std::ostream& os, LazyExpression const& lazyExpr ) -> std::ostream& {
         if( lazyExpr.m_isNegated )
             os << "!";
diff --git a/src/catch2/internal/catch_assertion_handler.hpp b/src/catch2/internal/catch_assertion_handler.hpp
index 0512f17f..646f12f4 100644
--- a/src/catch2/internal/catch_assertion_handler.hpp
+++ b/src/catch2/internal/catch_assertion_handler.hpp
@@ -27,8 +27,10 @@ namespace Catch {
         ITransientExpression const* m_transientExpression = nullptr;
         bool m_isNegated;
     public:
-        LazyExpression( bool isNegated );
-        LazyExpression( LazyExpression const& other );
+        LazyExpression( bool isNegated ):
+            m_isNegated(isNegated)
+        {}
+        LazyExpression(LazyExpression const& other) = default;
         LazyExpression& operator = ( LazyExpression const& ) = delete;
 
         explicit operator bool() const {