diff --git a/contrib/teamcity/gitian.sh b/contrib/teamcity/gitian.sh
index 9772ba97f..26d6d4aa7 100755
--- a/contrib/teamcity/gitian.sh
+++ b/contrib/teamcity/gitian.sh
@@ -1,38 +1,41 @@
 #!/bin/bash -e
 
 wget http://archive.ubuntu.com/ubuntu/pool/universe/v/vm-builder/vm-builder_0.12.4+bzr494.orig.tar.gz
 echo "76cbf8c52c391160b2641e7120dbade5afded713afaa6032f733a261f13e6a8e  vm-builder_0.12.4+bzr494.orig.tar.gz" | sha256sum -c
 # (verification -- must return OK)
 tar -zxvf vm-builder_0.12.4+bzr494.orig.tar.gz
 cd vm-builder-0.12.4+bzr494
 sudo python setup.py install
 cd ..
 
 ## Install Gitian
 git clone https://github.com/devrandom/gitian-builder.git
 
 export COMMIT=HEAD
 export URL=`pwd`
 export USE_LXC=1
 export LXC_BRIDGE=lxcbr0
 export GITIAN_HOST_IP=10.0.3.1
 export LXC_GUEST_IP=10.0.3.5
 
 cd gitian-builder
 
 if [[ "${OS_NAME}" == "osx" ]]; then
   wget https://storage.googleapis.com/f4936e83b2dcbca742be51fb9692b153/MacOSX10.11.sdk.tar.gz
   echo "4732b52b5ebe300c8c91cbeed6d19d59c1ff9c56c7a1dd6cfa518b9c2c72abde  MacOSX10.11.sdk.tar.gz" | sha256sum -c
   mkdir -p inputs
   echo "Downloaded"
   mv MacOSX10.11.sdk.tar.gz inputs
 fi
 
+## Determine the number of build threads
+THREADS=$(nproc || sysctl -n hw.ncpu)
+
 ./bin/make-base-vm --lxc --distro debian --suite stretch --arch amd64
-./bin/gbuild --commit bitcoin=${COMMIT} --url bitcoin=${URL} ../contrib/gitian-descriptors/gitian-${OS_NAME}.yml
+./bin/gbuild -j${THREADS} -m3500 --commit bitcoin=${COMMIT} --url bitcoin=${URL} ../contrib/gitian-descriptors/gitian-${OS_NAME}.yml
 
 cd ..
 mkdir ${OS_NAME}
 cp gitian-builder/result/*.yml ${OS_NAME}/
 mv gitian-builder/build/out/* ${OS_NAME}/
 rm -r ${OS_NAME}/src