diff --git a/.github/workflows/rust-dind.yml b/.github/workflows/rust-dind.yml
index 6fba601..f24e928 100644
--- a/.github/workflows/rust-dind.yml
+++ b/.github/workflows/rust-dind.yml
@@ -86,9 +86,7 @@ jobs:
             type=ref,event=branch
             type=ref,event=tag
             type=ref,event=pr
-            type=raw,value=${{ matrix.label }}
-            type=raw,value=rust-${{ matrix.version }}
-            type=raw,value=${{ matrix.host }}
+            type=raw,value=rust-${{ matrix.version }}+${{ matrix.host }}+${{ matrix.label }}
 
       # Build and push Docker image with Buildx (don't push on PR)
       # https://github.com/docker/build-push-action
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index e45a76c..48928f3 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -85,9 +85,7 @@ jobs:
             type=ref,event=branch
             type=ref,event=tag
             type=ref,event=pr
-            type=raw,value=${{ matrix.label }}
-            type=raw,value=rust-${{ matrix.version }}
-            type=raw,value=${{ matrix.host }}
+            type=raw,value=rust-${{ matrix.version }}+${{ matrix.host }}+${{ matrix.label }}
 
       # Build and push Docker image with Buildx (don't push on PR)
       # https://github.com/docker/build-push-action