diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 0e199d5a16c..8df33c48f2d 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -905,7 +905,7 @@ with pkgs;
 
   blobfuse = callPackage ../tools/filesystems/blobfuse { };
 
-  blockdiag = pythonPackages.blockdiag;
+  blockdiag = with python3Packages; toPythonApplication blockdiag;
 
   blsd = callPackage ../tools/misc/blsd {
     libgit2 = libgit2_0_27;