diff --git a/mcp_server/Dockerfile b/mcp_server/Dockerfile
index e6b84c87..4d2d95c2 100644
--- a/mcp_server/Dockerfile
+++ b/mcp_server/Dockerfile
@@ -30,7 +30,7 @@ RUN groupadd -r app && useradd -r -d /app -g app app
 COPY pyproject.toml uv.lock ./
 
 # Install dependencies first (better layer caching)
-RUN --mount=type=cache,target=/root/.cache/uv \
+RUN --mount=type=cache,id=uv,target=/root/.cache/uv \
     uv sync --frozen --no-dev
 
 # Copy application code