1 files changed, 3 insertions, 2 deletions

diff --git a/src/common/string_util.h b/src/common/string_util.h
index ba4cd363e..b1118816e 100644
--- a/src/common/string_util.h
+++ b/src/common/string_util.h
@@ -13,10 +13,11 @@
 #include "common/common.h"
 
 /// Make a string lowercase
-void LowerStr(char* str);
+
+std::string LowerStr(std::string str);
 
 /// Make a string uppercase
-void UpperStr(char* str);
+std::string UpperStr(std::string str);
 
 std::string StringFromFormat(const char* format, ...);
 // Cheap!