diff --git a/mitmproxy/addons/intercept.py b/mitmproxy/addons/intercept.py
index db229826a..46ed90a7c 100644
--- a/mitmproxy/addons/intercept.py
+++ b/mitmproxy/addons/intercept.py
@@ -51,4 +51,5 @@ class Intercept:
         self.process_flow(f)
 
     def tcp_message(self, f):
-        f.intercept()
+        if self.filt:
+            f.intercept()