diff --git a/src/python/src/setup.py b/src/python/src/setup.py
index 26121dcfab6..dbfffa2065b 100644
--- a/src/python/src/setup.py
+++ b/src/python/src/setup.py
@@ -49,6 +49,7 @@ _EXTENSION_INCLUDE_DIRECTORIES = (
 _EXTENSION_LIBRARIES = (
     'gpr',
     'grpc',
+    'rt',
 )
 
 _EXTENSION_MODULE = _core.Extension(