--- a/langtools/test/Makefile	Wed Jan 23 15:08:03 2013 +0000
+++ b/langtools/test/Makefile	Wed Jan 23 20:57:40 2013 +0000
@@ -272,6 +272,7 @@
 	@mkdir -p $(JTREG_OUTPUT_DIR)
 	JT_JAVA=$(JT_JAVA) $(JTREG) \
 	  -J-Xmx512m \
+	  -vmoption:-Xmx768m \
 	  -a -ignore:quiet -v:fail,error,nopass \
           -r:$(JTREG_OUTPUT_DIR)/JTreport \
           -w:$(JTREG_OUTPUT_DIR)/JTwork \