diff --git a/build.xml b/build.xml
index 9e9e7279d..e280dd39b 100644
--- a/build.xml
+++ b/build.xml
@@ -465,7 +465,7 @@
     <property name="queue.test.classes" value="${queue.classes}/testclasses"/>
     <property name="queue.test.sources" value="scala/test"/>
     <!-- provide a ceiling on the memory that unit/integration tests can consume. -->
-    <property name="test.maxmemory" value="4g"/>
+    <property name="test.maxmemory" value="5g"/>
 
     <!-- TEST -->
     <macrodef name="run-test">