diff --git a/etc/taskcluster/decision_task.py b/etc/taskcluster/decision_task.py
index 3da9c8a5ba4..58caf2fb0bc 100644
--- a/etc/taskcluster/decision_task.py
+++ b/etc/taskcluster/decision_task.py
@@ -601,12 +601,7 @@ def macos_wpt():
     build_task = macos_release_build()
     def macos_run_task(name):
         task = macos_task(name).with_python2()
-        return (
-            with_homebrew(task, ["etc/taskcluster/macos/Brewfile-gstreamer"])
-            .with_script("""
-                export PKG_CONFIG_PATH="$(brew --prefix libffi)/lib/pkgconfig/"
-            """)
-        )
+        return with_homebrew(task, ["etc/taskcluster/macos/Brewfile-gstreamer"])
     wpt_chunks("macOS x64", macos_run_task, build_task, repo_dir="repo",
                total_chunks=6, processes=4)