diff --git a/doc/source/conf.py b/doc/source/conf.py
index 057f6ba35..ae57ec4b2 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -39,6 +39,7 @@ MOCK_MODULES = [
     "ray.core.generated.ray.protocol.Task",
     "scipy",
     "scipy.signal",
+    "scipy.stats",
     "tensorflow",
     "tensorflow.contrib",
     "tensorflow.contrib.all_reduce",
diff --git a/src/ray/gcs/redis_module/ray_redis_module.cc b/src/ray/gcs/redis_module/ray_redis_module.cc
index 7d0bc63ce..ee1e00f85 100644
--- a/src/ray/gcs/redis_module/ray_redis_module.cc
+++ b/src/ray/gcs/redis_module/ray_redis_module.cc
@@ -1,4 +1,5 @@
 #include <string.h>
+#include <sstream>
 
 #include "ray/common/common_protocol.h"
 #include "ray/gcs/format/gcs_generated.h"