diff --git a/tests/filename/filenametest.cpp b/tests/filename/filenametest.cpp
index 0b14219dbb..8a8f6842f2 100644
--- a/tests/filename/filenametest.cpp
+++ b/tests/filename/filenametest.cpp
@@ -18,6 +18,7 @@
 #endif
 
 #ifndef WX_PRECOMP
+    #include "wx/utils.h"
 #endif // WX_PRECOMP
 
 #include "wx/filename.h"