diff --git a/tests/scopeguard/scopeguardtest.cpp b/tests/scopeguard/scopeguardtest.cpp
index 24c19fd981..83a73684dc 100644
--- a/tests/scopeguard/scopeguardtest.cpp
+++ b/tests/scopeguard/scopeguardtest.cpp
@@ -21,6 +21,7 @@
     #pragma hdrstop
 #endif
 
+#include "wx/string.h"
 #include "wx/scopeguard.h"
 
 // ----------------------------------------------------------------------------