diff --git a/utils_dev/RUN_build.bat b/utils_dev/RUN_build.bat
index e0e57b1834..3690a91a18 100644
--- a/utils_dev/RUN_build.bat
+++ b/utils_dev/RUN_build.bat
@@ -12,13 +12,13 @@
 @SET ANT_CLASSPATH=%CLASSPATH%;..\tools\lib\ant.jar;..\tools\lib\ant-launcher.jar;..\tools\lib\ant-swing.jar;..\tools\lib\ant-commons-net.jar;..\tools\lib\commons-net-1.4.0.jar
 @SET ANT_CLASSPATH=%ANT_CLASSPATH%;"%JAVA_HOME%\lib\tools.jar"
 
-@SET ANT_OPTS="-Xms512m -Xmx512m"
+@SET ANT_OPTS=-Xms512m -Xmx512m
 
 @echo Cleanup ...
-@"%JAVA_HOME%\bin\java" -classpath %ANT_CLASSPATH% -Dant.home="." org.apache.tools.ant.Main clean
+@"%JAVA_HOME%\bin\java" %ANT_OPTS% -classpath %ANT_CLASSPATH% -Dant.home="." org.apache.tools.ant.Main clean
 
 @echo Building ...
-@"%JAVA_HOME%\bin\java" -classpath %ANT_CLASSPATH% -Dant.home="." org.apache.tools.ant.Main -logger org.apache.tools.ant.listener.MailLogger complete
+@"%JAVA_HOME%\bin\java" %ANT_OPTS% -classpath %ANT_CLASSPATH% -Dant.home="." org.apache.tools.ant.Main -logger org.apache.tools.ant.listener.MailLogger complete
 @IF ERRORLEVEL 1 goto ERROR
 
 @Echo Done ...
diff --git a/utils_dev/RUN_build.sh b/utils_dev/RUN_build.sh
index fd44fc3948..1fdf1ab4e9 100755
--- a/utils_dev/RUN_build.sh
+++ b/utils_dev/RUN_build.sh
@@ -24,10 +24,10 @@ fi
 export ANT_CLASSPATH=$CLASSPATH:../tools/lib/ant.jar:../tools/lib/ant-launcher.jar:../tools/lib/ant-swing.jar:../tools/lib/ant-commons-net.jar:../tools/lib/commons-net.jar:$JAVA_HOME/lib/tools.jar
 
 echo Cleanup ...
-$JAVA_HOME/bin/java -classpath $ANT_CLASSPATH -Dant.home="." org.apache.tools.ant.Main clean
+$JAVA_HOME/bin/java -Xmx512m -classpath $ANT_CLASSPATH -Dant.home="." org.apache.tools.ant.Main clean
 
 echo Building ...
-$JAVA_HOME/bin/java   -Xmx500m -classpath $ANT_CLASSPATH -Dant.home="." org.apache.tools.ant.Main -logger org.apache.tools.ant.listener.MailLogger complete
+$JAVA_HOME/bin/java -Xmx512m -classpath $ANT_CLASSPATH -Dant.home="." org.apache.tools.ant.Main -logger org.apache.tools.ant.listener.MailLogger complete
 
 echo Done ...