diff --git a/tests/ci_build/build_via_cmake.sh b/tests/ci_build/build_via_cmake.sh
index f33c8a35d..0b53c5272 100755
--- a/tests/ci_build/build_via_cmake.sh
+++ b/tests/ci_build/build_via_cmake.sh
@@ -4,7 +4,7 @@ set -e
 # Build gtest via cmake
 rm -rf gtest
 wget -nc https://github.com/google/googletest/archive/release-1.7.0.zip
-unzip release-1.7.0.zip
+unzip -n release-1.7.0.zip
 mv googletest-release-1.7.0 gtest && cd gtest
 cmake . && make 
 mkdir lib && mv libgtest.a lib
diff --git a/tests/travis/run_test.sh b/tests/travis/run_test.sh
index aa8f1489d..32caf1825 100755
--- a/tests/travis/run_test.sh
+++ b/tests/travis/run_test.sh
@@ -117,7 +117,7 @@ if [ ${TASK} == "cmake_test" ]; then
     set -e
     # Build gtest via cmake
     wget -nc https://github.com/google/googletest/archive/release-1.7.0.zip
-    unzip release-1.7.0.zip
+    unzip -n release-1.7.0.zip
     mv googletest-release-1.7.0 gtest && cd gtest
     cmake . && make
     mkdir lib && mv libgtest.a lib