diff --git a/.github/workflows/release-extension.yml b/.github/workflows/release-extension.yml
index db95e2c..2b86d71 100644
--- a/.github/workflows/release-extension.yml
+++ b/.github/workflows/release-extension.yml
@@ -44,7 +44,7 @@ jobs:
 
       - uses: actions/upload-artifact@v4
         with:
-          name: ext-${{ matrix.php }}-${{ matrix.arch }}
+          name: ext-${{ matrix.php }}-${{ matrix.libc }}-${{ matrix.arch }}
           path: dist/*.so
 
   release:
@@ -63,6 +63,12 @@ jobs:
         run: |
           mkdir -p release
           find artifacts -name '*.so' -exec cp {} release/ \;
+          for expected in \
+            reysys-agent-php8.2-nts-glibc-amd64.so \
+            reysys-agent-php8.3-nts-glibc-amd64.so \
+            reysys-agent-php8.3-nts-musl-amd64.so; do
+            test -f "release/$expected" || { echo "matrix build missing from the release: $expected"; exit 1; }
+          done
           ( cd release && sha256sum ./*.so > SHA256SUMS )
           ls -l release