diff --git a/simulator-docker-runner/Dockerfile.simulator b/simulator-docker-runner/Dockerfile.simulator
index e0cd8b4c..7b4e7869 100644
--- a/simulator-docker-runner/Dockerfile.simulator
+++ b/simulator-docker-runner/Dockerfile.simulator
@@ -22,6 +22,7 @@ COPY cli ./cli/
 COPY sqlite3 ./sqlite3/
 COPY stress ./stress/
 COPY tests ./tests/
+COPY testing/sqlite_test_ext ./testing/sqlite_test_ext
 RUN cargo chef prepare --bin limbo_sim --recipe-path recipe.json
 
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