diff --git a/mitmproxy/proxy/layers/http/_http1.py b/mitmproxy/proxy/layers/http/_http1.py
index 08cb7157a..06f2f3c99 100644
--- a/mitmproxy/proxy/layers/http/_http1.py
+++ b/mitmproxy/proxy/layers/http/_http1.py
@@ -123,7 +123,6 @@ class Http1Connection(HttpConnection, metaclass=abc.ABCMeta):
         if self.buf:
             already_received = self.buf.maybe_extract_at_most(len(self.buf))
             yield from self.state(events.DataReceived(self.conn, already_received))
-            self.buf.compress()
 
     def passthrough(self, event: events.Event) -> layer.CommandGenerator[None]:
         assert self.stream_id
diff --git a/setup.py b/setup.py
index c02eda3d3..b8a766f90 100644
--- a/setup.py
+++ b/setup.py
@@ -73,6 +73,7 @@ setup(
         "click>=7.0,<8",
         "cryptography>=3.3,<3.4",
         "flask>=1.1.1,<1.2",
+        "h11>=0.11,<0.13",
         "h2>=4.0,<5",
         "hyperframe>=6.0,<7",
         "kaitaistruct>=0.7,<0.10",