diff --git a/wrapper/wrapper.C b/wrapper/wrapper.C
index 28ef6af816..12958289a4 100644
--- a/wrapper/wrapper.C
+++ b/wrapper/wrapper.C
@@ -39,6 +39,7 @@
 #include <string>
 #ifdef _WIN32
 #include "boinc_win.h"
+#include "win_util.h"
 #else
 #include <unistd.h>
 #include <sys/wait.h>