diff --git a/a8/mixedsession.cc b/a8/mixedsession.cc
index 6b1c35b..87e9f2f 100644
--- a/a8/mixedsession.cc
+++ b/a8/mixedsession.cc
@@ -15,10 +15,10 @@ namespace a8
 
     static bool IsHttpHead(char* buf, int buflen)
     {
-        return (buflen > 4 && strncmp("GET ", buf, 4)) ||
-            (buflen > 4 && strncmp("get ", buf, 4)) ||
-            (buflen > 5 && strncmp("POST ", buf, 5)) ||
-            (buflen > 5 && strncmp("post ", buf, 5));
+        return (buflen > 4 && strncmp("GET ", buf, 4) == 0) ||
+            (buflen > 4 && strncmp("get ", buf, 4) == 0) ||
+            (buflen > 5 && strncmp("POST ", buf, 5) == 0) ||
+            (buflen > 5 && strncmp("post ", buf, 5) == 0);
     }
 
     void MixedSession::Reset()