diff --git a/docker/Dockerfile b/docker/Dockerfile
index 0913cfba..3922477c 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -30,8 +30,8 @@ WORKDIR /root
 RUN git clone https://github.com/KLayout/klayout
 WORKDIR /root/klayout
 RUN git checkout ${KLAYOUT_COMMIT}
-RUN ./build.sh -qt5 -j 8 \
- && cp -r bin-release /usr/local/klayout
+RUN ./build.sh -qt5 -debug -j 8 \
+ && cp -r bin-debug /usr/local/klayout
 RUN rm -rf /root/klayout
 
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