diff --git a/tools/gradle.py b/tools/gradle.py
index 0e926e6..a52e3f3 100755
--- a/tools/gradle.py
+++ b/tools/gradle.py
@@ -41,6 +41,7 @@
 def GetJavaEnv(env):
   java_env = dict(env if env else os.environ, JAVA_HOME = jdk.GetJdkHome())
   java_env['PATH'] = java_env['PATH'] + os.pathsep + os.path.join(jdk.GetJdkHome(), 'bin')
+  java_env['GRADLE_OPTS'] = '-Xmx1g'
   return java_env
 
 def PrintCmd(s):