diff --git a/Xext/xvdisp.c b/Xext/xvdisp.c
index 243a0fddbf..87dce70993 100644
--- a/Xext/xvdisp.c
+++ b/Xext/xvdisp.c
@@ -730,6 +730,8 @@ ProcXvShmPutImage(ClientPtr client)
 #include "xvmcext.h"
 #endif
 
+__size_assert(int, sizeof(INT32));
+
 static int
 ProcXvQueryImageAttributes(ClientPtr client)
 {
@@ -765,7 +767,6 @@ ProcXvQueryImageAttributes(ClientPtr client)
 
     /* allocating for `offsets` as well as `pitches` in one block */
     /* both having CARD32 * num_planes (actually int32_t put into CARD32) */
-    __size_assert(int, sizeof(INT32));
     int *offsets = x_rpcbuf_reserve(&rpcbuf, 2 * num_planes * sizeof(int));
     if (!offsets)
         return BadAlloc;