diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index ea85bd3547b..32452c5e78a 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7650,6 +7650,7 @@ let
 
   opencascade = callPackage ../development/libraries/opencascade {
     tcl = tcl-8_5;
+    tk = tk-8_5;
   };
 
   opencascade_6_5 = callPackage ../development/libraries/opencascade/6.5.nix {