diff --git a/panda/src/physx/physxFileStream.h b/panda/src/physx/physxFileStream.h
index a8cc858b1b..5b7682c9e0 100644
--- a/panda/src/physx/physxFileStream.h
+++ b/panda/src/physx/physxFileStream.h
@@ -17,6 +17,7 @@
 #include "pandabase.h"
 #include "virtualFile.h"
 #include "filename.h"
+#include <stdio.h>
 
 #include "physx_includes.h"