diff --git a/absl/strings/str_join.h b/absl/strings/str_join.h
index 4772f5d..ae5731a 100644
--- a/absl/strings/str_join.h
+++ b/absl/strings/str_join.h
@@ -60,6 +60,7 @@
 #include "absl/strings/string_view.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 
 // -----------------------------------------------------------------------------
 // Concept: Formatter
@@ -286,6 +287,7 @@
   return strings_internal::JoinAlgorithm(value, separator, AlphaNumFormatter());
 }
 
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_STRINGS_STR_JOIN_H_