diff --git a/src/getchar.c b/src/getchar.c
index cc93a7d..cafa660 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -4530,7 +4530,7 @@
 	    if (q != NULL)
 	    {
 		vim_unescape_csi(q);
-		qlen = STRLEN(q);
+		qlen = (int)STRLEN(q);
 		vim_free(q);
 	    }
 	}