2 files changed, 6 insertions, 3 deletions
diff --git a/pkgs/applications/science/electronics/horizon-eda/base.nix b/pkgs/applications/science/electronics/horizon-eda/base.nix
index 8ce75a6ce241b..2a37c0265dc37 100644
--- a/pkgs/applications/science/electronics/horizon-eda/base.nix
+++ b/pkgs/applications/science/electronics/horizon-eda/base.nix
@@ -9,12 +9,14 @@
 , libgit2
 , librsvg
 , libuuid
-, opencascade-occt
+, opencascade-occt_7_6
 , pkg-config
 , podofo
 , sqlite
 }:
-
+let
+  opencascade-occt = opencascade-occt_7_6;
+in
 # This base is used in horizon-eda and python3Packages.horizon-eda
 rec {
   pname = "horizon-eda";
diff --git a/pkgs/applications/science/electronics/kicad/base.nix b/pkgs/applications/science/electronics/kicad/base.nix
index 209d47875f8d0..b5f721c3d772d 100644
--- a/pkgs/applications/science/electronics/kicad/base.nix
+++ b/pkgs/applications/science/electronics/kicad/base.nix
@@ -42,7 +42,7 @@
 , swig4
 , python
 , wxPython
-, opencascade-occt
+, opencascade-occt_7_6
 , libngspice
 , valgrind
 
@@ -65,6 +65,7 @@ assert testing -> !stable
   -> throw "testing implies stable and cannot be used with stable = false";
 
 let
+  opencascade-occt = opencascade-occt_7_6;
   inherit (lib) optional optionals optionalString;
 in
 stdenv.mkDerivation rec {