diff --git a/cpp/cpp_grpc_library.bzl b/cpp/cpp_grpc_library.bzl
index 446694a8..1e242ea6 100644
--- a/cpp/cpp_grpc_library.bzl
+++ b/cpp/cpp_grpc_library.bzl
@@ -37,7 +37,7 @@ def cpp_grpc_library(name, **kwargs):  # buildifier: disable=function-docstring
         deps = GRPC_DEPS + kwargs.get("deps", []),
         hdrs = [name_pb + "_hdrs"],
         includes = [name_pb] if kwargs.get("output_mode", "PREFIXED") == "PREFIXED" else ["."],
-		**{
+        **{
             k: v
             for (k, v) in kwargs.items()
             if k in bazel_build_rule_common_attrs + [
diff --git a/tools/rulegen/cpp.go b/tools/rulegen/cpp.go
index d08d2f63..f8e45c25 100644
--- a/tools/rulegen/cpp.go
+++ b/tools/rulegen/cpp.go
@@ -63,7 +63,7 @@ var cppGrpcLibraryRuleTemplate = mustTemplate(cppLibraryRuleTemplateString + `
         deps = GRPC_DEPS + kwargs.get("deps", []),
         hdrs = [name_pb + "_hdrs"],
         includes = [name_pb] if kwargs.get("output_mode", "PREFIXED") == "PREFIXED" else ["."],
-		**{
+        **{
             k: v
             for (k, v) in kwargs.items()
             if k in bazel_build_rule_common_attrs + [