diff --git a/src/Generator/Passes/MoveFunctionToClassPass.cs b/src/Generator/Passes/MoveFunctionToClassPass.cs
index 07fff615..5e5d295a 100644
--- a/src/Generator/Passes/MoveFunctionToClassPass.cs
+++ b/src/Generator/Passes/MoveFunctionToClassPass.cs
@@ -24,8 +24,7 @@ namespace CppSharp.Passes
 
             Class @class = FindClassToMoveFunctionTo(function);
 
-            if (@class == null ||
-                @class.TranslationUnit.Module != function.TranslationUnit.Module)
+            if (@class == null)
                 return false;
 
             // Create a new fake method so it acts as a static method.
diff --git a/tests/NamespacesDerived/NamespacesDerived.cpp b/tests/NamespacesDerived/NamespacesDerived.cpp
index c403ec9f..51740df9 100644
--- a/tests/NamespacesDerived/NamespacesDerived.cpp
+++ b/tests/NamespacesDerived/NamespacesDerived.cpp
@@ -92,3 +92,8 @@ DerivedFromSecondaryBaseInDependency::DerivedFromSecondaryBaseInDependency()
 DerivedFromSecondaryBaseInDependency::~DerivedFromSecondaryBaseInDependency()
 {
 }
+
+bool operator<<(const Base& b, const char* str)
+{
+    return false;
+}
diff --git a/tests/NamespacesDerived/NamespacesDerived.h b/tests/NamespacesDerived/NamespacesDerived.h
index a2a7b490..a5a66d43 100644
--- a/tests/NamespacesDerived/NamespacesDerived.h
+++ b/tests/NamespacesDerived/NamespacesDerived.h
@@ -87,6 +87,8 @@ public:
     ~DerivedFromSecondaryBaseInDependency();
 };
 
+DLL_API bool operator<<(const Base& b, const char* str);
+
 namespace NamespacesBase
 {
     class DLL_API ClassInNamespaceNamedAfterDependency