diff --git a/api_core/setup.py b/api_core/setup.py
index 46f6de02b026..5a7fe04ba408 100644
--- a/api_core/setup.py
+++ b/api_core/setup.py
@@ -40,7 +40,7 @@
 ]
 extras = {
     'grpc': 'grpcio >= 1.8.2',
-    'grpcio-gcp': 'grpcio-gcp >= 0.2.2'
+    'grpcgcp': 'grpcio-gcp >= 0.2.2'
 }
 
 
diff --git a/spanner/setup.py b/spanner/setup.py
index 07fdb0341cf7..d1677a7674aa 100644
--- a/spanner/setup.py
+++ b/spanner/setup.py
@@ -29,7 +29,7 @@
 # 'Development Status :: 5 - Production/Stable'
 release_status = 'Development Status :: 5 - Production/Stable'
 dependencies = [
-    'google-api-core[grpc, grpcio-gcp] >= 1.4.1, < 2.0.0dev',
+    'google-api-core[grpc, grpcgcp] >= 1.4.1, < 2.0.0dev',
     'google-cloud-core >= 0.28.0, < 0.29dev',
     'grpc-google-iam-v1 >= 0.11.4, < 0.12dev',
 ]