diff --git a/.github/workflows/build-linux.yml b/.github/workflows/build-linux.yml
index 4039711f2..32c3bd8aa 100644
--- a/.github/workflows/build-linux.yml
+++ b/.github/workflows/build-linux.yml
@@ -85,7 +85,7 @@ jobs:
           bash .github/scripts/unix.sh -t
       - name: Upload build directory
         uses: actions/upload-artifact@v2
-        if: ${{ matrix.build_type  == "Release" }}
+        if: matrix.build_type  == 'Release'
         with:
           name: gtsam-${{ matrix.name }}-${{ matrix.build_type }}
           path: ${{ github.workspace }}/build/
diff --git a/.github/workflows/build-macos.yml b/.github/workflows/build-macos.yml
index 1d36e048f..cf1a474e3 100644
--- a/.github/workflows/build-macos.yml
+++ b/.github/workflows/build-macos.yml
@@ -53,7 +53,7 @@ jobs:
           bash .github/scripts/unix.sh -t
       - name: Upload build directory
         uses: actions/upload-artifact@v2
-        if: ${{ matrix.build_type == "Release" }}
+        if: matrix.build_type == 'Release'
         with:
           name: gtsam-${{ matrix.name }}-${{ matrix.build_type }}
           path: ${{ github.workspace }}/build/
diff --git a/.github/workflows/build-windows.yml b/.github/workflows/build-windows.yml
index 8e469d49f..7eb908c94 100644
--- a/.github/workflows/build-windows.yml
+++ b/.github/workflows/build-windows.yml
@@ -78,7 +78,7 @@ jobs:
           cmake --build build --config ${{ matrix.build_type }} --target check.linear
       - name: Upload build directory
         uses: actions/upload-artifact@v2
-        if: ${{ matrix.build_type == "Release" }}
+        if: matrix.build_type == 'Release'
         with:
           name: gtsam-${{ matrix.name }}-${{ matrix.build_type }}
           path: ${{ github.workspace }}/build/