diff --git a/action.yaml b/action.yaml
index ecfb0ef..63ca8aa 100644
--- a/action.yaml
+++ b/action.yaml
@@ -48,7 +48,10 @@ runs:
   steps:
     - name: Install defang
       shell: bash
-      run: . <(curl -Lf https://raw.githubusercontent.com/DefangLabs/defang/main/src/bin/install || echo return $?)
+      run: |
+        if ! which defang >/dev/null 2>&1; then
+          . <(curl -Lf https://raw.githubusercontent.com/DefangLabs/defang/main/src/bin/install || echo return $?)
+        fi
       env:
         DEFANG_INSTALL_VERSION: ${{ inputs['cli-version'] }}
         GH_TOKEN: ${{ github.token }} # avoid rate-limits