diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index ef520db327b..1ad2a42e46a 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -2937,7 +2937,7 @@ in {
 
 
   blockdiag = buildPythonPackage rec {
-    name = "blockdiag";
+    name = "blockdiag-${version}";
     version = "1.5.3";
 
     src = pkgs.fetchurl {