diff --git a/Dockerfile b/Dockerfile
index 1f39115..e0df7ce 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -28,6 +28,9 @@ ENV BRANCH_NAME 'cm-14.1'
 # eg. DEVICE_LIST=hammerhead,bullhead,angler
 ENV DEVICE_LIST ''
 
+# Release type string
+ENV RELEASE_TYPE 'UNOFFICIAL'
+
 # OTA URL that will be used inside CMUpdater
 # Use this in combination with LineageOTA to make sure your device can auto-update itself from this buildbot
 ENV OTA_URL ''
diff --git a/src/build.sh b/src/build.sh
index e312600..5e3d6ee 100755
--- a/src/build.sh
+++ b/src/build.sh
@@ -70,6 +70,10 @@ if ! [ -z "$DEVICE_LIST" ]; then
   echo ">> [$(date)] Preparing build environment" >> $DOCKER_LOG
   source build/envsetup.sh 2>&1 >&$DEBUG_LOG
 
+  echo ">> [$(date)] Setting \"$RELEASE_TYPE\" as release type" >> $DOCKER_LOG
+  sed -i '/#.*Filter out random types/d' vendor/cm/config/common.mk
+  sed -i '/$(filter .*$(CM_BUILDTYPE)/,+3d' vendor/cm/config/common.mk
+
   # Set a custom updater URI if a OTA URL is provided
   if ! [ -z "$OTA_URL" ]; then
     echo ">> [$(date)] Adding OTA URL '$OTA_URL' to build.prop" >> $DOCKER_LOG