diff --git a/Dockerfile b/Dockerfile
index b2b2ff8..e9b80ef 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,6 +4,6 @@ RUN mkdir -p /usr/src/preservetube/metadata
 WORKDIR /usr/src/preservetube/metadata
 
 COPY . /usr/src/preservetube/metadata
-RUN -mount=type=secret,id=npmrc,target=/root/.npmrc yarn
+RUN --mount=type=secret,id=npmrc,target=/root/.npmrc yarn
 
 CMD ["node", "index.js"]
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