diff --git a/docker/Dockerfile b/docker/Dockerfile
index 9a535414..0b6c6ceb 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -43,6 +43,10 @@ COPY ./src/ ./src/
 # TODO: .git folder is required for building – this is destructive.
 # See definition of CURRENT_BRANCH, CURRENT_COMMIT and CURRENT_VERSION.
 COPY ./.git/ ./.git/
+
+RUN crystal spec --warnings all \
+    --link-flags "-lxml2 -llzma"
+
 RUN crystal build ./src/invidious.cr \
     --static --warnings all \
     --link-flags "-lxml2 -llzma"
diff --git a/docker/Dockerfile.arm64 b/docker/Dockerfile.arm64
index 1ec95d8a..54226b66 100644
--- a/docker/Dockerfile.arm64
+++ b/docker/Dockerfile.arm64
@@ -43,6 +43,10 @@ COPY ./src/ ./src/
 # TODO: .git folder is required for building – this is destructive.
 # See definition of CURRENT_BRANCH, CURRENT_COMMIT and CURRENT_VERSION.
 COPY ./.git/ ./.git/
+
+RUN crystal spec --warnings all \
+    --link-flags "-lxml2 -llzma"
+
 RUN crystal build ./src/invidious.cr \
     --static --warnings all \
     --link-flags "-lxml2 -llzma"