diff --git a/dix/tables.c b/dix/tables.c
index 3e22b65..888620d 100644
--- a/dix/tables.c
+++ b/dix/tables.c
@@ -724,7 +724,7 @@ EventSwapPtr EventSwapVector[128] =
 };
 
 
-ReplySwapPtr ReplySwapVector[256] =
+const ReplySwapPtr ReplySwapVector[256] =
 {
     ReplyNotSwappd,
     ReplyNotSwappd,
diff --git a/include/dixstruct.h b/include/dixstruct.h
index 6734695..87527f2 100644
--- a/include/dixstruct.h
+++ b/include/dixstruct.h
@@ -188,7 +188,7 @@ int (* ProcVector[256]) (ClientPtr /*client*/);
 int (* SwappedProcVector[256]) (ClientPtr /*client*/);
 
 
-extern ReplySwapPtr ReplySwapVector[256];
+extern const ReplySwapPtr ReplySwapVector[256];
 
 int ProcBadRequest(ClientPtr /*client*/);