diff --git a/Xext/bigreq.c b/Xext/bigreq.c
index 188d1b37d..a9e106a0c 100644
--- a/Xext/bigreq.c
+++ b/Xext/bigreq.c
@@ -37,7 +37,7 @@ from The Open Group.
 #include "os.h"
 #include "dixstruct.h"
 #include "extnsionst.h"
-#include <X11/extensions/bigreqproto.h>
+#include <X11/extensions/bigreqsproto.h>
 #include "opaque.h"
 #include "modinit.h"