diff --git a/pkgs/build-support/dart/fetch-dart-deps/default.nix b/pkgs/build-support/dart/fetch-dart-deps/default.nix
index e523b60797eb..51052cae18f4 100644
--- a/pkgs/build-support/dart/fetch-dart-deps/default.nix
+++ b/pkgs/build-support/dart/fetch-dart-deps/default.nix
@@ -169,6 +169,8 @@ let
       dart pub deps --json | jq .packages > $out
       runHook postBuild
     '';
+
+    dontInstall = true;
   } // (removeAttrs buildDrvInheritArgs [ "name" "pname" ]));
 
   # As of Dart 3.0.0, Pub checks the revision of cached Git-sourced packages.