diff --git a/src/getchar.c b/src/getchar.c
index ff71952..c0dfc2b 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -3836,8 +3836,9 @@
 
 #if defined(FEAT_EVAL) || defined(PROTO)
     void
-reset_last_used_map(void)
+reset_last_used_map(mapblock_T *mp)
 {
-    last_used_map = NULL;
+    if (last_used_map == mp)
+	last_used_map = NULL;
 }
 #endif