diff --git a/httpie/models.py b/httpie/models.py
index f6b9dff9..af6163fd 100644
--- a/httpie/models.py
+++ b/httpie/models.py
@@ -102,8 +102,7 @@ class HTTPRequest(HTTPMessage):
         )
 
         headers = dict(self._orig.headers)
-
-        if 'Host' not in headers:
+        if 'Host' not in self._orig.headers:
             headers['Host'] = url.netloc.split('@')[-1]
 
         headers = ['%s: %s' % (name, value)
diff --git a/tests/test_regressions.py b/tests/test_regressions.py
new file mode 100644
index 00000000..8c21d1d3
--- /dev/null
+++ b/tests/test_regressions.py
@@ -0,0 +1,17 @@
+"""Miscellaneous regression tests"""
+import socket
+
+from utils import http, HTTP_OK
+
+
+def test_Host_header_overwrite():
+    """
+    https://github.com/jakubroztocil/httpie/issues/235
+
+    """
+    host = 'httpbin.org'
+    url = 'http://{httpbin_ip}/get'.format(
+        httpbin_ip=socket.gethostbyname(host))
+    r = http('--print=hH', url, 'host:{}'.format(host))
+    assert HTTP_OK in r
+    assert r.lower().count('host:') == 1