diff --git a/Xext/xvmc.c b/Xext/xvmc.c
index ecd7f0336..e37ee7c38 100644
--- a/Xext/xvmc.c
+++ b/Xext/xvmc.c
@@ -21,6 +21,7 @@
 #ifdef HAS_XVMCSHM
 #ifndef Lynx
 #include <sys/ipc.h>
+#include <sys/types.h>
 #include <sys/shm.h>
 #else
 #include <ipc.h>