diff --git a/buildbot/master/files/config/environments.py b/buildbot/master/files/config/environments.py
index ab007216..76bb5c0c 100644
--- a/buildbot/master/files/config/environments.py
+++ b/buildbot/master/files/config/environments.py
@@ -51,6 +51,7 @@ def without(self, to_unset):
 build_common = Environment({
     'RUST_BACKTRACE': '1',
     'BUILD_MACHINE': str(util.Property('slavename')),
+    'SCCACHE_IDLE_TIMEOUT': '0',
 })
 
 build_windows_msvc = build_common + Environment({