diff --git a/mkosi/mkosi.tools.conf/mkosi.conf b/mkosi/mkosi.tools.conf/mkosi.conf
index 6be11eb6af..4befc518b1 100644
--- a/mkosi/mkosi.tools.conf/mkosi.conf
+++ b/mkosi/mkosi.tools.conf/mkosi.conf
@@ -6,3 +6,4 @@ Packages=
         gdb
         llvm
         meson # Also needed in the NO_BUILD case so we list it explicitly.
+        valgrind