diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index abee6cf41e9..6f7bf8fc784 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -136,13 +136,16 @@ default:
       policy: $BUILD_CACHE_POLICY
   before_script:
     - source .gitlab/gitlab-utils.sh
-    - export GRADLE_USER_HOME=`pwd`/.gradle
+    - export GRADLE_USER_HOME=$(pwd)/.gradle
     - |
       # Don't put jvm args here as it will be picked up by child gradle processes used in tests
       cat << EOF > $GRADLE_USER_HOME/gradle.properties
       mavenRepositoryProxy=$MAVEN_REPOSITORY_PROXY
       gradlePluginProxy=$GRADLE_PLUGIN_PROXY
       EOF
+    - |
+      # replace maven central part by MAVEN_REPOSITORY_PROXY in .mvn/wrapper/maven-wrapper.properties
+      sed -i "s|https://repo.maven.apache.org/maven2/|$MAVEN_REPOSITORY_PROXY|g" .mvn/wrapper/maven-wrapper.properties
     - export GRADLE_OPTS="-Dorg.gradle.jvmargs='-Xmx$GRADLE_MEM -Xms$GRADLE_MEM -XX:ErrorFile=/tmp/hs_err_pid%p.log -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp'"
     - export GRADLE_ARGS=" --build-cache --stacktrace --no-daemon --parallel --max-workers=$GRADLE_WORKERS"
     - *normalize_node_index
@@ -371,7 +374,7 @@ muzzle:
     - ./gradlew writeMuzzleTasksToFile $GRADLE_ARGS
     - sort workspace/build/muzzleTasks > sortedMuzzleTasks
     - split --number=l/$NORMALIZED_NODE_TOTAL --suffix-length=1 --numeric-suffixes sortedMuzzleTasks muzzleSplit
-    - ./gradlew `cat muzzleSplit${NORMALIZED_NODE_INDEX} | xargs` $GRADLE_ARGS
+    - ./gradlew $(cat muzzleSplit${NORMALIZED_NODE_INDEX} | xargs) $GRADLE_ARGS
   after_script:
     - *cgroup_info
     - source .gitlab/gitlab-utils.sh