diff --git a/scripts/editor.bash b/scripts/editor.bash
index 3ae51ed335..b43703d1be 100755
--- a/scripts/editor.bash
+++ b/scripts/editor.bash
@@ -1,6 +1,12 @@
 #!/usr/bin/env bash
 
+# Fail on errors
 set -euxo pipefail
+
+# Increase heap size
+export NODE_OPTIONS="--max_old_space_size=4096"
+
+# Build mermaid
 pnpm build
 
 # Clone the Mermaid Live Editor repository