diff --git a/src/editline.c b/src/editline.c
index b9796a4..7300606 100644
--- a/src/editline.c
+++ b/src/editline.c
@@ -1683,7 +1683,7 @@ static size_t find_key_in_map(int key, el_keymap_t map[], size_t mapsz)
 {
     size_t i;
 
-    for (i = 0; map[i].Function; i++) {
+    for (i = 0; map[i].Function && i < mapsz; i++) {
 	if (map[i].Key == key)
 	    return i;
     }