diff --git a/centos-7/Dockerfile b/centos-7/Dockerfile
index fa2539de3a6c4032d94a1d03eb9d2802e6c1e845..23c48ae017fac0fc80471d17fd56344f4bc6c59e 100644
--- a/centos-7/Dockerfile
+++ b/centos-7/Dockerfile
@@ -190,7 +190,9 @@ RUN version=3.4.8 && \
         -D WITH_ZLIB=ON -D BUILD_ZLIB=OFF \
         -D WITH_V4L=ON \
         && \
-    ninja -C build install
+    ninja -C build install && \
+    cd .. && \
+    rm -rf opencv-${version}* opencv_contrib-${version}*
 
 # MXNet
 ENV MXNet_DIR /opt/mxnet-1.5.1