diff --git a/api/graphics_api.C b/api/graphics_api.C
index 7b1d53d6b0..caa1450453 100755
--- a/api/graphics_api.C
+++ b/api/graphics_api.C
@@ -43,6 +43,7 @@ HANDLE graphics_threadh=NULL;
 #include "util.h"
 #include "app_ipc.h"
 #include "error_numbers.h"
+#include "filesys.h"
 #include "boinc_api.h"
 #include "graphics_api.h"
 #include "filesys.h"