diff --git a/tests/benchmarks/printfbench.cpp b/tests/benchmarks/printfbench.cpp
index 4fa8c3dbee..9187aa7208 100644
--- a/tests/benchmarks/printfbench.cpp
+++ b/tests/benchmarks/printfbench.cpp
@@ -31,6 +31,7 @@
 #include <wx/utils.h>
 #include <wx/cmdline.h>
 #include <wx/app.h>
+#include <wx/wxchar.h>
 
 
 // ----------------------------------------------------------------------------