diff --git a/Jenkinsfile b/Jenkinsfile
index ffded48e..79f71c57 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -24,7 +24,7 @@ pipeline {
             description: 'The xmosdoc version'
         )
         booleanParam(name: 'NIGHTLY_TEST_ONLY',
-            defaultValue: false,
+            defaultValue: true, //TODO reset value to false
             description: 'Tests that only run during nightly builds.')
 
     }
diff --git a/tools/ci/helper_functions.sh b/tools/ci/helper_functions.sh
index 54fd8b13..0151f122 100755
--- a/tools/ci/helper_functions.sh
+++ b/tools/ci/helper_functions.sh
@@ -57,7 +57,7 @@ function export_ci_build_vars {
         export CI_BUILD_TOOL_ARGS=""
     else
         export CI_BUILD_TOOL="make"
-        export CI_BUILD_TOOL_ARGS="-j"
+        export CI_BUILD_TOOL_ARGS="-j$(nproc)"
     fi
 }