diff --git a/etc/taskcluster/decision_task.py b/etc/taskcluster/decision_task.py
index 12208eb0f25..6c979c15663 100644
--- a/etc/taskcluster/decision_task.py
+++ b/etc/taskcluster/decision_task.py
@@ -125,6 +125,8 @@ linux_build_env = {
     "CCACHE": "sccache",
     "RUSTC_WRAPPER": "sccache",
     "SCCACHE_IDLE_TIMEOUT": "1200",
+    "CC": "clang",
+    "CXX": "clang++",
 }
 macos_build_env = {}
 windows_build_env = {