diff --git a/src/fold.c b/src/fold.c
index 4daaf70..41cdd1a 100644
--- a/src/fold.c
+++ b/src/fold.c
@@ -2076,7 +2076,7 @@
 	{
 	    while (vim_iswhite(s[len]))
 		++len;
-	    mch_memmove(s, s + len, STRLEN(s + len) + 1);
+	    STRMOVE(s, s + len);
 	}
 	else
 	{