diff --git a/.github/workflows/cmake-build.yaml b/.github/workflows/cmake-build.yaml
index 3a60681..28e962a 100644
--- a/.github/workflows/cmake-build.yaml
+++ b/.github/workflows/cmake-build.yaml
@@ -6,8 +6,8 @@ on: [ push ]
 
 env:
   VALGRIND_GIT_TAG: VALGRIND_3_22_0
-  VALGRIND_PREFIX: $HOME/valgrind
-  UMB_VALGRIND_BIN: $HOME/valgrind/bin/valgrind
+  VALGRIND_PREFIX: ${HOME}/valgrind
+  UMB_VALGRIND_BIN: ${HOME}/valgrind/bin/valgrind
 
 jobs:
   build: