diff --git a/docker-unit-tests.sh b/docker-unit-tests.sh
old mode 100644
new mode 100755
index 6bfde48c0..8406ba86a
--- a/docker-unit-tests.sh
+++ b/docker-unit-tests.sh
@@ -1,4 +1,11 @@
-#!/bin/bash
+#!/bin/bash -x
+
+BUILD_CORES=$(echo "scale=0 ; `nproc` / 1.337" | bc)
+
+if [[ "$GITHUB_REPOSITORY" == "" ]]; then
+  #Default
+  BUILD_CORES=8
+fi
 
 echo "Mounting $(pwd)/io in ubuntu and running unit tests"
-docker run --rm -i -v $(pwd):/io ubuntu sh -c '/io/release-build/xahaud -u'
+docker run --rm -i -v $(pwd):/io -e BUILD_CORES=$BUILD_CORES ubuntu sh -c '/io/release-build/xahaud --unittest-jobs $BUILD_CORES -u'