diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 8df33c48f2d..448ff8fd622 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -5074,7 +5074,7 @@ with pkgs;
 
   setserial = callPackage ../tools/system/setserial { };
 
-  seqdiag = pythonPackages.seqdiag;
+  seqdiag = with python3Packages; toPythonApplication seqdiag;
 
   screenfetch = callPackage ../tools/misc/screenfetch { };