diff --git a/absl/base/internal/identity.h b/absl/base/internal/identity.h
index 086447c..a3154ed 100644
--- a/absl/base/internal/identity.h
+++ b/absl/base/internal/identity.h
@@ -16,7 +16,10 @@
 #ifndef ABSL_BASE_INTERNAL_IDENTITY_H_
 #define ABSL_BASE_INTERNAL_IDENTITY_H_
 
+#include "absl/base/config.h"
+
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace internal {
 
 template <typename T>
@@ -28,6 +31,7 @@
 using identity_t = typename identity<T>::type;
 
 }  // namespace internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_BASE_INTERNAL_IDENTITY_H_