diff --git a/pom.xml b/pom.xml
index b957e0e..d39cda4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -144,7 +144,7 @@
 				<configuration>
 					<forkMode>once</forkMode>
 					<!-- avoid out of memory errors: -->
-					<argLine>@{argLine} -Djava.awt.headless=true -Dmatsim.preferLocalDtds=true</argLine>
+					<argLine>@{argLine} -Xmx6500m -Djava.awt.headless=true -Dmatsim.preferLocalDtds=true</argLine>
 					<!--necessary in tu berlin gitlab. BUT not good in other places, so solve by command line switch only where needed.  kai, nov'18-->
 					<!--<useSystemClassLoader>false</useSystemClassLoader>-->
 				</configuration>