diff --git a/pkgs/by-name/um/umami/package.nix b/pkgs/by-name/um/umami/package.nix
index 9042e1e5d3d3..e8c7c978287a 100644
--- a/pkgs/by-name/um/umami/package.nix
+++ b/pkgs/by-name/um/umami/package.nix
@@ -87,18 +87,24 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     hash = "sha256-rkOD52suE6bihJqKvMdIvqHRIcWhSxXzUkCfmdNbC40=";
   };
 
-  # install dev dependencies as well, for rollup
-  pnpmInstallFlags = [ "--prod=false" ];
-
   pnpmDeps = pnpm.fetchDeps {
     inherit (finalAttrs)
       pname
-      pnpmInstallFlags
       version
       src
       ;
+    # prevent downloading dependencies for windows
+    # which bloat derivation size and fail to build on hydra
+    # https://github.com/NixOS/nixpkgs/pull/467820#issuecomment-3624054271
+    pnpmInstallFlags = [
+      "--force=false"
+      "--os=linux"
+      "--os=darwin"
+      "--cpu=x64"
+      "--cpu=arm64"
+    ];
     fetcherVersion = 2;
-    hash = "sha256-eXurT8kfVJcJoFunrt7h8LKuhsIhGrYDW6shvGA6GXY=";
+    hash = "sha256-bqeJ0wzCtnuR6V67Qe1N9UcaHPLziuBhsn7eN8JVJbQ=";
   };
 
   env.CYPRESS_INSTALL_BINARY = "0";