diff --git a/include/net/tcp.h b/include/net/tcp.h
index b7d8317f22acf9d256d79c48eabd8c7b2e723c83..cd8fa0c858aedfd0a7295a9c9b84130fc8f339e7 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -242,7 +242,7 @@ extern int tcp_memory_pressure;
 
 static inline int before(__u32 seq1, __u32 seq2)
 {
-        return (__s32)(seq2-seq1) > 0;
+        return (__s32)(seq1-seq2) < 0;
 }
 #define after(seq2, seq1) 	before(seq1, seq2)