diff --git a/site2/tools/build-site.sh b/site2/tools/build-site.sh
index 91363dbc24283..dbd4940995d3a 100755
--- a/site2/tools/build-site.sh
+++ b/site2/tools/build-site.sh
@@ -23,6 +23,7 @@ VERSION=`${ROOT_DIR}/src/get-project-version.py`
 
 set -x -e
 
+export NODE_OPTIONS="--max-old-space-size=2048" #increase to 2gb, default is 512mb
 ${ROOT_DIR}/site2/tools/generate-api-docs.sh
 cd ${ROOT_DIR}/site2/website
 yarn
@@ -76,4 +77,4 @@ mkdir -p ${ROOT_DIR}/generated-site/content
 cp -R ${ROOT_DIR}/generated-site/api ${ROOT_DIR}/generated-site/content
 cp -R ./build/pulsar/* ${ROOT_DIR}/generated-site/content
 cp -R ${ROOT_DIR}/generated-site/tools ${ROOT_DIR}/generated-site/content
-cp -R ${ROOT_DIR}/site2/website/static/swagger/* ${ROOT_DIR}/generated-site/content/swagger/
\ No newline at end of file
+cp -R ${ROOT_DIR}/site2/website/static/swagger/* ${ROOT_DIR}/generated-site/content/swagger/