diff --git a/tests/depends/error_manager/src/error_manager_stub.cc b/tests/depends/error_manager/src/error_manager_stub.cc
index 5f62c91b..c2d61b4a 100644
--- a/tests/depends/error_manager/src/error_manager_stub.cc
+++ b/tests/depends/error_manager/src/error_manager_stub.cc
@@ -18,7 +18,7 @@
 
 using namespace ErrorMessage;
 
-namespace ErrorMessage {
+namespace error_message {
 int FormatErrorMessage(char *str_dst, size_t dst_max, const char *format, ...) {
   return 1;
 }