diff --git a/xkb/XKBMAlloc.c b/xkb/XKBMAlloc.c
index 4b7428b2e..9feaf8e93 100644
--- a/xkb/XKBMAlloc.c
+++ b/xkb/XKBMAlloc.c
@@ -399,7 +399,7 @@ KeyCode		matchingKeys[XkbMaxKeyCount],nMatchingKeys;
 	}
 	if (nResize>0) {
 	    int nextMatch;
-	    xkb->map->size_syms= (nTotal*12)/10;
+	    xkb->map->size_syms= (nTotal*15)/10;
 	    newSyms = _XkbTypedCalloc(xkb->map->size_syms,KeySym);
 	    if (newSyms==NULL)
 		return BadAlloc;