diff --git a/README.md b/README.md
index 248c5c0..a98ff50 100644
--- a/README.md
+++ b/README.md
@@ -128,7 +128,7 @@ spack load jupyter
 Spack is a great tool, but sometimes things may fall over. These are the equivalents of *Have you tried turning it off an on again?* for Spack:
 
 * Uninstall all versions of the Dune package: `spack uninstall dune`
-* Clear all build caches `spack clear -a`
+* Clear all build caches `spack clean -a`
 * Remove `$HOME/.spack` (note you need to re-add the Dune repository afterwards: `spack repo add <path-to-dune-spack>`
 
 If your problem persists, report it on [the issue tracker](https://gitlab.dune-project.org/spack/dune-spack/issues).