diff --git a/tasks/openapi-version/task.yaml b/tasks/openapi-version/task.yaml
index 14befa6..afc26d0 100644
--- a/tasks/openapi-version/task.yaml
+++ b/tasks/openapi-version/task.yaml
@@ -11,9 +11,6 @@ spec:
     - name: ref
       type: string
       description: Full Git ref string (e.g., refs/tags/v0.2.0)
-    - name: specDomain
-      type: string
-      default: ""
   workspaces:
     - name: base
       description: Git-cloned source code
@@ -37,7 +34,7 @@ spec:
         DOMAIN_FROM_REF=$(echo "$FULL_REF" | awk -F'[/-]' '{print $2}')
         TAG_FROM_REF=$(basename "$FULL_REF")  # → 0.2.0
 
-        OPENAPI_FILE="specs/$(params.specDomain)/openapi.yaml"
+        OPENAPI_FILE="specs/${DOMAIN_FROM_REF}/openapi.yaml"
         echo "📄 Reading version from openapi.yaml of ${OPENAPI_FILE}..."
         VERSION=$(yq '.info.version' "$OPENAPI_FILE")
         TAG_FROM_OPENAPI="${VERSION}"