diff --git a/src/common/unichar.cpp b/src/common/unichar.cpp
index 4aa43533df..9e8ef8df4f 100644
--- a/src/common/unichar.cpp
+++ b/src/common/unichar.cpp
@@ -19,6 +19,10 @@
     #pragma hdrstop
 #endif
 
+#ifndef WX_PRECOMP
+    #include "wx/strconv.h"  // wxConvLibc
+#endif
+
 #include "wx/unichar.h"
 
 // ===========================================================================