diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1ca9638a..2fe802cb 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -4,6 +4,7 @@ on: [push, pull_request]
 
 env:
   LC_ALL: C
+  KALEIDOSCOPE_CCACHE: 1
   ARDUINO_DIRECTORIES_USER: ${{ github.workspace }}/.arduino/user
 jobs:
   smoke-sketches: