diff --git a/cmd/tools/fast/fast.v b/cmd/tools/fast/fast.v
index 1631d6582f..76d95d2d8f 100644
--- a/cmd/tools/fast/fast.v
+++ b/cmd/tools/fast/fast.v
@@ -4,7 +4,7 @@
 import os
 import time
 
-const voptions = ' -skip-unused -show-timings -stats '
+const voptions = ' -usecache -skip-unused -show-timings -stats '
 
 const exe = os.executable()