diff --git a/README.md b/README.md
index d5906ba..e6a72ac 100644
--- a/README.md
+++ b/README.md
@@ -9,5 +9,5 @@ docker run --rm --name testdb -u 1000 -e POSTGRES_PASSWORD=password -v $(pwd)/te
 
 Perform the migration:
 ```bash
-./build.sh && docker run -u 1000 -e POSTGRES_PASSWORD=password -v $(pwd)/test-db:/db --rm -it pierre42100/postgresmig:16to17
+./build.sh && docker run -u 1000 -e POSTGRES_USER=postgres -e POSTGRES_PASSWORD=password -v $(pwd)/test-db:/db --rm -it pierre42100/postgresmig:16to17
 ```
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