diff --git a/src/normal.c b/src/normal.c
index 17db06a..f2527e1 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -5986,7 +5986,7 @@
 	    oap->motion_type = MCHAR;
 	    oap->inclusive = FALSE;
 	    if (has_mbyte)
-		i = mb_string2cells(ptr, STRLEN(ptr));
+		i = mb_string2cells(ptr, (int)STRLEN(ptr));
 	    else
 		i = (int)STRLEN(ptr);
 	    if (cap->count0 > 0 && cap->count0 <= 100)