diff --git a/install_mysql-5.7.sh b/install_mysql-5.7.sh
index 118553e..a935291 100755
--- a/install_mysql-5.7.sh
+++ b/install_mysql-5.7.sh
@@ -866,8 +866,8 @@ if [[ "X${PIDS}X" != "XX" ]];then
          fi
 
          for _PID in $PIDS ; do
-            echo "kill -9 $PID" >> ${logdir}/main.log
-            kill -9 $PID >> ${logdir}/main.log 2>&1
+            echo "kill -9 $_PID" >> ${logdir}/main.log
+            kill -9 $_PID >> ${logdir}/main.log 2>&1
          done
 
          sleep 2