diff --git a/tools/internal_test.py b/tools/internal_test.py
index 311b610..43985f5 100755
--- a/tools/internal_test.py
+++ b/tools/internal_test.py
@@ -57,7 +57,8 @@
 
 TEST_COMMANDS = [
     # Run test.py internal testing.
-    ['tools/test.py', '--only_internal', '--slow_tests'],
+    ['tools/test.py', '--only_internal', '--slow_tests',
+     '--java_max_memory_size=4G'],
     # Ensure that all internal apps compile.
     ['tools/run_on_app.py', '--ignore-java-version','--run-all', '--out=out']
 ]