diff --git a/4GB-start.sh b/4GB-start.sh
index ba4c153..76e3658 100644
--- a/4GB-start.sh
+++ b/4GB-start.sh
@@ -33,7 +33,7 @@ fi
 # Limits Java JVM stack size and maximum heap usage.
 # Comment out for bigger systems, e.g. non-routers
 # or when API documentation is enabled
-JVM_MEMORY_ARGS="-Xss64m -Xmx2128m -XX:MaxRAM=2172m -XX:+UseSerialGC"
+JVM_MEMORY_ARGS="-Xss512m -Xmx2128m -XX:MaxRAM=2172m -XX:+UseSerialGC"
 
 # Although java.net.preferIPv4Stack is supposed to be false
 # by default in Java 11, on some platforms (e.g. FreeBSD 12),