diff --git a/source/lib/config.h b/source/lib/config.h
index 166297ab42..398c7f51df 100644
--- a/source/lib/config.h
+++ b/source/lib/config.h
@@ -313,9 +313,11 @@
 
 // strdup, wcsdup
 #if OS_MACOSX
-# define HAVE_STRDUP 0
+# define HAVE_STRDUP 1
+# define HAVE_WCSDUP 0
 #else
 # define HAVE_STRDUP 1
+# define HAVE_WCSDUP 1
 #endif
 
 // emulation needed on VC8 because this function is "deprecated"
diff --git a/source/lib/posix/posix.cpp b/source/lib/posix/posix.cpp
index 79465e82a5..ba7a1355d6 100644
--- a/source/lib/posix/posix.cpp
+++ b/source/lib/posix/posix.cpp
@@ -74,7 +74,6 @@ uint fpclassifyf(float f)
 
 
 #if !HAVE_STRDUP
-
 char* strdup(const char* str)
 {
 	const size_t num_chars = strlen(str);
@@ -84,7 +83,9 @@ char* strdup(const char* str)
 	SAFE_STRCPY(dst, str);
 	return dst;
 }
+#endif
 
+#if !HAVE_WCSDUP
 wchar_t* wcsdup(const wchar_t* str)
 {
 	const size_t num_chars = wcslen(str);
@@ -94,5 +95,4 @@ wchar_t* wcsdup(const wchar_t* str)
 	SAFE_WCSCPY(dst, str);
 	return dst;
 }
-
-#endif	// #if !HAVE_STRDUP
+#endif	// #if !HAVE_WCSDUP
diff --git a/source/lib/posix/posix.h b/source/lib/posix/posix.h
index 882dea859d..76141c46de 100644
--- a/source/lib/posix/posix.h
+++ b/source/lib/posix/posix.h
@@ -84,8 +84,10 @@ need only be renamed (e.g. _open, _stat).
 
 #if !HAVE_STRDUP
 extern char* strdup(const char* str);
+#endif
+#if !HAVE_WCSDUP
 extern wchar_t* wcsdup(const wchar_t* str);
-#endif	// #if !HAVE_STRDUP
+#endif
 
 
 #if !HAVE_C99_MATH