diff --git a/alltests b/alltests
index 3c9db301c404bd632ce5ae08241786f248495eab..8f596da8f93495dd33019ffe10fc96caf6f0c579 100755
--- a/alltests
+++ b/alltests
@@ -1,3 +1,6 @@
 #!/bin/bash
 FWDIR=`dirname $0`
+if [ "x$SPARK_MEM" == "x" ]; then
+  export SPARK_MEM=500m
+fi
 $FWDIR/run org.scalatest.tools.Runner -p $FWDIR/build/classes -o $@