diff --git a/src/memline.c b/src/memline.c
index 6f0143c..d9043dc 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -1983,7 +1983,7 @@
 	     */
 	    if (mch_stat((char *)buf->b_ffname, &st) == -1
 		    || st.st_mtime != buf->b_mtime_read
-		    || (size_t)st.st_size != buf->b_orig_size)
+		    || st.st_size != buf->b_orig_size)
 	    {
 		ml_preserve(buf, FALSE);
 		did_check_timestamps = FALSE;