diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e50ab46..043de14 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -24,15 +24,17 @@ jobs:
           - 0.13.2
           - 0.13.1
           - 0.13.0
+    env:
+      DOCKER_TAG: v${{ matrix.version }}-${{ matrix.arch }}
     steps:
       - uses: actions/checkout@v1
       - name: Register Docker QEMU
         run: docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
       - name: Build lukechilds/bitcoind
-        run: docker build --build-arg ARCH=${{ matrix.arch }} --build-arg VERSION=${{ matrix.version }} -t lukechilds/bitcoind:v${{ matrix.version }}-${{ matrix.arch }} .
+        run: docker build --build-arg ARCH=${{ matrix.arch }} --build-arg VERSION=${{ matrix.version }} -t lukechilds/bitcoind:$DOCKER_TAG .
       - name: Log image data
         run: docker images lukechilds/bitcoind
       - name: Log OS details
-        run: docker run --entrypoint sh lukechilds/bitcoind:v${{ matrix.version }}-${{ matrix.arch }} '-c' 'uname -a && . /etc/os-release && echo $PRETTY_NAME'
+        run: docker run --entrypoint sh lukechilds/bitcoind:$DOCKER_TAG '-c' 'uname -a && . /etc/os-release && echo $PRETTY_NAME'
       - name: Check bitcoind -version
-        run: (docker run lukechilds/bitcoind:v${{ matrix.version }}-${{ matrix.arch }} -version | tee /dev/stderr | grep -q ${{ matrix.version }}) 2>&1
+        run: (docker run lukechilds/bitcoind:$DOCKER_TAG -version | tee /dev/stderr | grep -q ${{ matrix.version }}) 2>&1