diff --git a/.github/workflows/flake-update.yml b/.github/workflows/flake-update.yml
index 7f52fa0..ea46ced 100644
--- a/.github/workflows/flake-update.yml
+++ b/.github/workflows/flake-update.yml
@@ -36,8 +36,11 @@ jobs:
               run: |
                 wget --content-disposition -nv "$DETERMINATE_URL"
 
-                git diff --quiet && git ls-files --error-unmatch "$DETERMINATE_BINARY"
-                echo "DETERMINATE_BINARY_DIFF=$?" | tee -a "$GITHUB_OUTPUT"
+                if git diff --quiet && git ls-files --error-unmatch "$DETERMINATE_BINARY"; then
+                  echo "DETERMINATE_BINARY_DIFF=0" | tee -a "$GITHUB_OUTPUT"
+                else
+                  echo "DETERMINATE_BINARY_DIFF=1" | tee -a "$GITHUB_OUTPUT"
+                fi
               env:
                 DETERMINATE_URL: ${{ env.DETERMINATE_URL }}
                 DERMINATE_BINARY: ${{ env.DETERMINATE_BINARY }}