diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 27a8401f297d..24ebe5e2f9e2 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -15722,7 +15722,7 @@ with pkgs;
 
   openscad = libsForQt5.callPackage ../applications/graphics/openscad { };
 
-  opentimestamps-client = python3Packages.callPackage ../tools/misc/opentimestamps-client { };
+  opentimestamps-client = callPackage ../tools/misc/opentimestamps-client { };
 
   opentoonz = libsForQt5.callPackage ../applications/graphics/opentoonz { };