diff --git a/.github/workflows/cloud-dispatch-build.yaml b/.github/workflows/cloud-dispatch-build.yaml
index a681efa8b0..e72eed3634 100644
--- a/.github/workflows/cloud-dispatch-build.yaml
+++ b/.github/workflows/cloud-dispatch-build.yaml
@@ -55,14 +55,9 @@ jobs:
             REF="${PR_HEAD_SHA}"
             BRANCH="${PR_HEAD_REF}"
 
-            # Derive variant from labels
-            VARIANT="gpu"
-            if [ "${ACTION}" = "labeled" ]; then
-              [ "${LABEL_NAME}" = "preview-cpu" ] && VARIANT="cpu"
-            else
-              # synchronize — check existing labels on the PR
-              echo "${PR_LABELS}" | grep -q '"preview-cpu"' && VARIANT="cpu"
-            fi
+            # Derive variant from all PR labels (default to cpu for frontend-only previews)
+            VARIANT="cpu"
+            echo "${PR_LABELS}" | grep -q '"preview-gpu"' && VARIANT="gpu"
           else
             REF="${GITHUB_SHA}"
             BRANCH="${GITHUB_REF_NAME}"