diff --git a/Dockerfile.test b/Dockerfile.test
index d566c435..debbfa8b 100644
--- a/Dockerfile.test
+++ b/Dockerfile.test
@@ -6,6 +6,7 @@ RUN apt-get update \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
+ENV PYTHONPATH=/app
 
 # Copy requirements first so Docker can cache the install layer
 COPY backend/engine/requirements.txt backend/engine/requirements.txt