diff --git a/src/ops.c b/src/ops.c
index e3e7827..cdc3080 100644
--- a/src/ops.c
+++ b/src/ops.c
@@ -1608,7 +1608,7 @@
 
     if (oap->block_mode)
     {
-	size_t			ins_len;
+	int			ins_len;
 	char_u			*firstline, *ins_text;
 	struct block_def	bd2;
 	int			did_indent = FALSE;