diff --git a/.travis.yml b/.travis.yml
index 2bbd63e8..ceb3b6df 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,7 @@ cache:
   directories:
     $HOME/.ivy2
     regression/install
+    emulator/verilator/install
 
 # packages needed to build riscv-tools
 addons: