diff --git a/trunk/Dockerfile.cov b/trunk/Dockerfile.cov
index 00ff9ac70..d86c7cfab 100644
--- a/trunk/Dockerfile.cov
+++ b/trunk/Dockerfile.cov
@@ -7,7 +7,6 @@ RUN yum install -y gcc make gcc-c++ patch unzip perl git
 COPY . /srs
 WORKDIR /srs/trunk
 
-# Note that we never build the utest, but only build srs.
 # Note that we must enable the gcc7 or link failed.
 RUN scl enable devtoolset-7 -- ./configure --srt=on --utest=on --gcov=on --jobs=2
-RUN scl enable devtoolset-7 -- make -j2
+RUN scl enable devtoolset-7 -- make -j2 utest