diff --git a/.circleci/config.yml b/.circleci/config.yml
index 907ce546a..21c150eec 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -9,6 +9,8 @@ jobs:
   test:
     docker:
       - image: ossrs/srs:dev
+    fixes:
+      - "src/::trunk/src"
     steps:
       - checkout
       - run: cd trunk && ./configure --gcov && make && ./objs/srs_utest && bash auto/coverage.sh
diff --git a/trunk/auto/coverage.sh b/trunk/auto/coverage.sh
index 79eef9dfe..7ec4748e5 100644
--- a/trunk/auto/coverage.sh
+++ b/trunk/auto/coverage.sh
@@ -1,25 +1,25 @@
 #!/bin/bash
 
 # In .circleci/config.yml, generate *.gcno with
-#       ./configure --gcov --without-research --without-librtmp
+#       ./configure --gcov --without-research --without-librtmp && make
 # and generate *.gcda by
 #       ./objs/srs_utest
 
+# Workdir is objs/cover.
+mkdir -p objs/cover && cd objs/cover
+ret=$?; if [[ $ret -ne 0 ]]; then echo "Enter workdir failed, ret=$ret"; exit $ret; fi
+
 # Collect all *.gcno and *.gcda to objs/cover.
-(mkdir -p objs/cover && cd objs/cover &&
-cp -R ../../src . &&
-for file in `find ../src -name "*.gcno"`; do cp $file .; done &&
-for file in `find ../src -name "*.gcda"`; do cp $file .; done)
+(rm -rf src && cp -R ../../src . && cp -R ../src .)
 ret=$?; if [[ $ret -ne 0 ]]; then echo "Collect *.gcno and *.gcda failed, ret=$ret"; exit $ret; fi
 
-# Generate *.gcov to objs/cover
+# Generate *.gcov for coverage.
 for file in `find src -name "*.cpp"`; do
-    (mkdir -p objs/cover && cd objs/cover && gcov ../../$file -o .)
+    gcov $file -o `dirname $file`
     ret=$?; if [[ $ret -ne 0 ]]; then echo "Collect $file failed, ret=$ret"; exit $ret; fi
 done
 
 # Upload report with *.gcov
 export CODECOV_TOKEN="493bba46-c468-4e73-8b45-8cdd8ff62d96" &&
-mkdir -p objs/cover && cd objs/cover &&
 bash <(curl -s https://codecov.io/bash)
 exit 0