diff --git a/absl/base/internal/cycleclock.cc b/absl/base/internal/cycleclock.cc
index e9844b7..0e65005 100644
--- a/absl/base/internal/cycleclock.cc
+++ b/absl/base/internal/cycleclock.cc
@@ -28,6 +28,7 @@
 #include "absl/base/internal/unscaledcycleclock.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace base_internal {
 
 #if ABSL_USE_UNSCALED_CYCLECLOCK
@@ -102,4 +103,5 @@
 #endif
 
 }  // namespace base_internal
+ABSL_NAMESPACE_END
 }  // namespace absl