diff --git a/absl/algorithm/container.h b/absl/algorithm/container.h
index 5dae9fd..d72532d 100644
--- a/absl/algorithm/container.h
+++ b/absl/algorithm/container.h
@@ -55,6 +55,7 @@
 #include "absl/meta/type_traits.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace container_algorithm_internal {
 
 // NOTE: it is important to defer to ADL lookup for building with C++ modules,
@@ -1720,6 +1721,7 @@
                           output_first, std::forward<BinaryOp>(op));
 }
 
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_ALGORITHM_CONTAINER_H_