diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index e8205cb41d2..cb6fee5977d 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -19269,7 +19269,7 @@ in {
   };
   protobuf3_0 = callPackage ../development/python-modules/protobuf.nix {
     disabled = isPyPy;
-    doCheck = isPy3k;
+    doCheck = !isPy3k;
     protobuf = pkgs.protobuf3_0;
   };
   protobuf2_6 = callPackage ../development/python-modules/protobuf.nix {