diff --git a/pkgs/applications/science/electronics/kicad/libraries.nix b/pkgs/applications/science/electronics/kicad/libraries.nix
index 2073b2bd7c16..e26b73c4f04c 100644
--- a/pkgs/applications/science/electronics/kicad/libraries.nix
+++ b/pkgs/applications/science/electronics/kicad/libraries.nix
@@ -24,9 +24,13 @@ let
           zip
         ];
 
-      postInstall = lib.optional (name == "packages3d") ''
-        find $out -type f -name '*.step' | parallel 'stepreduce {} {} && zip -9 {.}.stpZ {} && rm {}'
-      '';
+      postInstall =
+        lib.optionalString (name == "packages3d") ''
+          find $out -type f -name '*.step' | parallel 'stepreduce {} {} && zip -9 {.}.stpZ {} && rm {}'
+        ''
+        + lib.optionalString (name == "footprints") ''
+          grep -rl '\.step' $out | xargs sed -i 's/\.step/.stpZ/g'
+        '';
 
       meta = {
         license = lib.licenses.cc-by-sa-40;