diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index cbf654b98900..b5995dc4daa1 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -8087,7 +8087,8 @@ in {
       sha256 = "038ign7qlavlmvrhb2y8bygbxvy4j7bx2k1zg0i3wblg2ja50w7h";
     };
 
-    propagatedBuildInputs = with self; [ pyramid hawkauthlib tokenlib webtest ];
+    propagatedBuildInputs = with self; [ pyramid hawkauthlib tokenlib ];
+    buildInputs = with self; [ webtest ];
   };
 
   pyroute2 = callPackage ../development/python-modules/pyroute2 { };
@@ -26268,7 +26269,7 @@ EOF
       pyramid sqlalchemy simplejson mozsvc cornice pyramid_hawkauth pymysql
       pymysqlsa umemcache WSGIProxy requests pybrowserid
     ];
-    buildInputs = with self; [ testfixtures unittest2  ];
+    buildInputs = with self; [ testfixtures unittest2 webtest ];
 
     #doCheck = false; # lazy packager
   };