diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 5bc4f46..e1e82d7 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -42,14 +42,14 @@ jobs:
         head ${{ steps.plumed.outputs.dependency_file }}
         plumed --version
         
-  test_stable:
-    # strategy:
-    #   matrix:
-    runs-on: ubuntu-latest
+#   test_stable:
+#     # strategy:
+#     #   matrix:
+#     runs-on: ubuntu-latest
 
-    steps:
-    - uses: Iximiel/install-plumed@v1
-    - name: run plumed
-      run: |
-        plumed --version
+#     steps:
+#     - uses: Iximiel/install-plumed@v1
+#     - name: run plumed
+#       run: |
+#         plumed --version
     
\ No newline at end of file
diff --git a/install-plumed.sh b/install-plumed.sh
index adc7d0e..146644b 100755
--- a/install-plumed.sh
+++ b/install-plumed.sh
@@ -46,8 +46,8 @@ if [[ -n "$SUFFIX" ]]; then
 fi
 
 #just to be sure
-prefix=${PREFIX-~/opt}
-prefix=${prefix/~/$HOME}
+prefix=${PREFIX:-"$HOME/opt"}
+prefix=${prefix/'~'/$HOME}
 mkdir -p "$prefix"
 prefix=$(realpath "$prefix")
 plumed_options="$plumed_options --prefix=\"$prefix\""