diff --git a/libmproxy/flow.py b/libmproxy/flow.py
index 93bb6ab06..a2b069edc 100644
--- a/libmproxy/flow.py
+++ b/libmproxy/flow.py
@@ -13,7 +13,7 @@ import urlparse
 from netlib import wsgi
 from netlib.exceptions import HttpException
 from netlib.http import CONTENT_MISSING, Headers, http1
-from . import controller, tnetstring, filt, script, version
+from . import controller, tnetstring, filt, script, version, flow_format_compat
 from .onboarding import app
 from .proxy.config import HostMatcher
 from .protocol.http_replay import RequestReplayThread
@@ -1112,14 +1112,13 @@ class FlowReader:
         try:
             while True:
                 data = tnetstring.load(self.fo)
-                if tuple(data["version"][:2]) != version.IVERSION[:2]:
-                    v = ".".join(str(i) for i in data["version"])
-                    raise FlowReadError(
-                        "Incompatible serialized data version: %s" % v
-                    )
+                try:
+                    data = flow_format_compat.migrate_flow(data)
+                except ValueError as e:
+                    raise FlowReadError(str(e))
                 off = self.fo.tell()
                 yield HTTPFlow.from_state(data)
-        except ValueError as v:
+        except ValueError:
             # Error is due to EOF
             if self.fo.tell() == off and self.fo.read() == '':
                 return
diff --git a/libmproxy/flow_format_compat.py b/libmproxy/flow_format_compat.py
new file mode 100644
index 000000000..02fa41a32
--- /dev/null
+++ b/libmproxy/flow_format_compat.py
@@ -0,0 +1,33 @@
+"""
+This module handles the import of mitmproxy flows generated by old versions.
+"""
+from __future__ import absolute_import, print_function, division
+from . import version
+
+
+def convert_013_014(data):
+    data["request"]["first_line_format"] = data["request"].pop("form_in")
+    data["request"]["http_version"] = "HTTP/" + ".".join(str(x) for x in data["request"].pop("httpversion"))
+    data["response"]["status_code"] = data["response"].pop("code")
+    data["response"]["body"] = data["response"].pop("content")
+    data["server_conn"].pop("state")
+    data["server_conn"]["via"] = None
+    data["version"] = version.IVERSION
+    return data
+
+converters = {
+    (0, 13): convert_013_014
+}
+
+
+def migrate_flow(flow_data):
+    while True:
+        flow_version = tuple(flow_data["version"][:2])
+        if flow_version == version.IVERSION[:2]:
+            break
+        elif flow_version in converters:
+            flow_data = converters[flow_version](flow_data)
+        else:
+            v = ".".join(str(i) for i in flow_data["version"])
+            raise ValueError("Incompatible serialized data version: {}".format(v))
+    return flow_data