diff --git a/pkgs/development/python-modules/marionette-harness/mozdevice.nix b/pkgs/development/python-modules/marionette-harness/mozdevice.nix
index 03187c00bef9..56c8fc5254d2 100644
--- a/pkgs/development/python-modules/marionette-harness/mozdevice.nix
+++ b/pkgs/development/python-modules/marionette-harness/mozdevice.nix
@@ -12,9 +12,8 @@ buildPythonPackage rec {
   format = "wheel";
 
   src = fetchPypi {
-    inherit pname version;
+    inherit pname version format;
     sha256 = "1n7l3drdh3rm3320v98c9hhh37ljk9l861hyw18psca7jdd717n5";
-    format = "wheel";
   };
 
   propagatedBuildInputs = [ mozlog moznetwork mozprocess ];
diff --git a/pkgs/development/python-modules/poster3/default.nix b/pkgs/development/python-modules/poster3/default.nix
index 269995717aa4..09e8055bdd91 100644
--- a/pkgs/development/python-modules/poster3/default.nix
+++ b/pkgs/development/python-modules/poster3/default.nix
@@ -15,8 +15,7 @@ buildPythonPackage rec {
   disabled = !isPy3k;
 
   src = fetchPypi {
-    inherit pname version;
-    format = "wheel";
+    inherit pname version format;
     python = "py3";
     sha256 = "1b27d7d63e3191e5d7238631fc828e4493590e94dcea034e386c079d853cce14";
   };
diff --git a/pkgs/development/python-modules/tensorflow-tensorboard/1/default.nix b/pkgs/development/python-modules/tensorflow-tensorboard/1/default.nix
index 6cc3636b7f30..f58b1a207719 100644
--- a/pkgs/development/python-modules/tensorflow-tensorboard/1/default.nix
+++ b/pkgs/development/python-modules/tensorflow-tensorboard/1/default.nix
@@ -20,8 +20,7 @@ buildPythonPackage rec {
 
   src = fetchPypi ({
     pname = "tensorboard";
-    inherit version;
-    format = "wheel";
+    inherit version format;
   } // (if isPy3k then {
     python = "py3";
     sha256 = "1g62i3nrgp8q9wfsyqqjkkfnsz7x2k018c26kdh527h1yrjjrbac";
diff --git a/pkgs/development/python-modules/tensorflow-tensorboard/2/default.nix b/pkgs/development/python-modules/tensorflow-tensorboard/2/default.nix
index 945896dda018..d0cf7f28f4d6 100644
--- a/pkgs/development/python-modules/tensorflow-tensorboard/2/default.nix
+++ b/pkgs/development/python-modules/tensorflow-tensorboard/2/default.nix
@@ -21,8 +21,7 @@ buildPythonPackage rec {
 
   src = fetchPypi ({
     pname = "tensorboard";
-    inherit version;
-    format = "wheel";
+    inherit version format;
   } // (if isPy3k then {
     python = "py3";
     sha256 = "1wpjdzhjpcdkyaahzd4bl71k4l30z5c55280ndiwj32hw70lxrp6";