diff --git a/cpp/CHANGELOG.md b/cpp/CHANGELOG.md
index a32c991748..49612ccdad 100644
--- a/cpp/CHANGELOG.md
+++ b/cpp/CHANGELOG.md
@@ -5,6 +5,7 @@ Please mark all change in change log and use the ticket from JIRA.
 # Milvus 0.3.0 (TBD)
 
 ## Bug
+- MS-102 - Fix build script file condition error
 - MS-80 - Fix server hang issue
 - MS-89 - Fix compile failed, libgpufaiss.a link missing
 - MS-90 - Fix arch match incorrect on ARM
diff --git a/cpp/build.sh b/cpp/build.sh
index fde45e8ce8..f1936559ad 100755
--- a/cpp/build.sh
+++ b/cpp/build.sh
@@ -64,7 +64,7 @@ cd cmake_build
 
 CUDA_COMPILER=/usr/local/cuda/bin/nvcc
 
-if [[ ${MAKE_CLEAN} = "ON" ]]; then
+if [[ ${MAKE_CLEAN} == "ON" ]]; then
     CMAKE_CMD="cmake -DBUILD_UNIT_TEST=${BUILD_UNITTEST} \
     -DCMAKE_INSTALL_PREFIX=${INSTALL_PREFIX}
     -DCMAKE_BUILD_TYPE=${BUILD_TYPE} \
@@ -84,8 +84,10 @@ if [[ ${BUILD_TYPE} != "Debug" ]]; then
     strip src/milvus_server
 fi
 
-if [[ ${BUILD_COVERAGE} = "ON" ]]; then
-    bash coverage.sh
+if [[ ${BUILD_COVERAGE} == "ON" ]]; then
+    cd -
+    bash `pwd`/coverage.sh
+    cd -
 fi
 
 make install
diff --git a/cpp/coverage.sh b/cpp/coverage.sh
old mode 100644
new mode 100755