diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index d4714d6..53472e2 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2613,7 +2613,7 @@
 	trace_ext4_discard_blocks(sb,
 			(unsigned long long) discard_block, count);
 	ret = sb_issue_discard(sb, discard_block, count);
-	if (ret == EOPNOTSUPP) {
+	if (ret == -EOPNOTSUPP) {
 		ext4_warning(sb, "discard not supported, disabling");
 		clear_opt(EXT4_SB(sb)->s_mount_opt, DISCARD);
 	}