diff --git a/.circleci/config.yml b/.circleci/config.yml
index b3c32a70e..bbd69e4b9 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -221,7 +221,7 @@ jobs:
             export OMR_PATH="$CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME/${CIRCLE_BRANCH:-$CIRCLE_TAG}"
             export OMR_FEED_URL="$CIRCLE_REPOSITORY_URL"
             export OMR_FEED_SRC="${CIRCLE_BRANCH:-$CIRCLE_TAG}"
-            sh build.sh prepare {tools,toolchain}/install -j2
+            sh build.sh prepare {tools,toolchain}/install -j1 V=s
             echo -e "$OMR_PRIVKEY" > ~/openmptcprouter/$OMR_TARGET/source/key-build
             echo -e "$OMR_PUBKEY" > ~/openmptcprouter/$OMR_TARGET/source/key-build.pub
 
@@ -291,7 +291,7 @@ jobs:
       - run:
           name: Build
           no_output_timeout: 30m
-          command: make IGNORE_ERRORS=m -C ~/openmptcprouter/$OMR_TARGET/source package/{compile,install,index} target/compile -j2 package/compile -j2 target/install -j2
+          command: make IGNORE_ERRORS=m -C ~/openmptcprouter/$OMR_TARGET/source package/{compile,install,index} target/compile package/compile target/install -j1 V=s
 
       - run:
           name: Deploy