diff --git a/build/docker/centos6/Dockerfile b/build/docker/centos6/Dockerfile
index 33d5dad..d0dc51a 100644
--- a/build/docker/centos6/Dockerfile
+++ b/build/docker/centos6/Dockerfile
@@ -42,7 +42,8 @@
 
 # CMake
 RUN curl -sSL https://cmake.org/files/v3.4/cmake-3.4.1.tar.gz | tar -xz && \
-    cd cmake-3.4.1 && ./bootstrap && make -j4 && make install
+    cd cmake-3.4.1 && ./bootstrap && make -j4 && make install && \
+    cd .. && rm -rf cmake-3.4.1
 
 ENV THRIFT_ROOT /thrift
 RUN mkdir -p $THRIFT_ROOT/src