diff --git a/utils_dev/RUN_build.bat b/utils_dev/RUN_build.bat
index 3690a91a18..8b7af3e5e4 100644
--- a/utils_dev/RUN_build.bat
+++ b/utils_dev/RUN_build.bat
@@ -12,10 +12,10 @@
 @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=-Xms128m -Xmx512m
 
 @echo Cleanup ...
-@"%JAVA_HOME%\bin\java" %ANT_OPTS% -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" %ANT_OPTS% -classpath %ANT_CLASSPATH% -Dant.home="." org.apache.tools.ant.Main -logger org.apache.tools.ant.listener.MailLogger complete
diff --git a/utils_dev/RUN_build.sh b/utils_dev/RUN_build.sh
index 1fdf1ab4e9..5c59a6efa8 100755
--- a/utils_dev/RUN_build.sh
+++ b/utils_dev/RUN_build.sh
@@ -23,11 +23,13 @@ fi
 #classpath
 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
 
+export ANT_OPTS="-Xms128m -Xmx512m"
+
 echo Cleanup ...
-$JAVA_HOME/bin/java -Xmx512m -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 -Xmx512m -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
 
 echo Done ...
 
diff --git a/utils_dev/RUN_buildIncremental.bat b/utils_dev/RUN_buildIncremental.bat
index a6885b12c0..02ff5e8a94 100644
--- a/utils_dev/RUN_buildIncremental.bat
+++ b/utils_dev/RUN_buildIncremental.bat
@@ -12,10 +12,10 @@
 @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=-Xms128m -Xmx512m
 
 @echo Building ...
-@"%JAVA_HOME%\bin\java" -classpath %ANT_CLASSPATH% -Dant.home="." %ANT_PROPERTIES% org.apache.tools.ant.Main update
+@"%JAVA_HOME%\bin\java" %ANT_OPTS% -classpath %ANT_CLASSPATH% -Dant.home="." %ANT_PROPERTIES% org.apache.tools.ant.Main update
 @Echo ErrorLevel = %ERRORLEVEL%
 
 @IF NOT ERRORLEVEL 0 GOTO BUILDOK
diff --git a/utils_dev/RUN_buildIncremental.sh b/utils_dev/RUN_buildIncremental.sh
index 83baca02a9..a9d924d8a5 100755
--- a/utils_dev/RUN_buildIncremental.sh
+++ b/utils_dev/RUN_buildIncremental.sh
@@ -34,8 +34,10 @@ fi
 #classpath
 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
 
+export ANT_OPTS="-Xms128m -Xmx512m"
+
 echo Building ...
-$JAVA_HOME/bin/java -classpath $ANT_CLASSPATH -Dant.home="." org.apache.tools.ant.Main update
+$JAVA_HOME/bin/java $ANT_OPTS -classpath $ANT_CLASSPATH -Dant.home="." org.apache.tools.ant.Main update
 
 # start adempiere server
 if [ $ADEMPIERE_HOME ] ; then