diff --git a/bin/publish-maven-artifacts b/bin/publish-maven-artifacts
index c732c9abe63..9f6ce0cf8a5 100755
--- a/bin/publish-maven-artifacts
+++ b/bin/publish-maven-artifacts
@@ -42,8 +42,8 @@ LOG=/tmp/kotlin-build-`date +%Y%m%d-%H%M%S`.log
 echo "*** Writing build log to $LOG"
 
 (
-export MAVEN_OPTS=-Xmx1024m
-export ANT_OPTS=-Xmx1024m
+export MAVEN_OPTS="-Xms512m -Xmx1024M -XX:PermSize=256m -XX:MaxPermSize=512m"
+export ANT_OPTS="-Xms512m -Xmx1024M -XX:PermSize=256m -XX:MaxPermSize=512m"
 
 set -x -e