diff --git a/hb_internal/common/misc.py b/hb_internal/common/misc.py
index ce1d1642731180329fcc260c053db708df86493e..bb4fc25e6e4d9f63f301fffd3e21d957dbef436f 100644
--- a/hb_internal/common/misc.py
+++ b/hb_internal/common/misc.py
@@ -60,7 +60,8 @@ class PreBuild:
         os.environ['CCACHE_LOGFILE'] = logfile
         os.environ['USE_CCACHE'] = '1'
         os.environ['CCACHE_DIR'] = ccache_base
-        os.environ['CCACHE_MASK'] = '002'
+        os.environ['CCACHE_UMASK'] = '002'
+        os.environ['CCACHE_BASEDIR'] = self._root_path
         ccache_max_size = os.environ.get('CCACHE_MAXSIZE')
         if not ccache_max_size:
             ccache_max_size = '100G'