1 files changed, 1 insertions, 1 deletions

diff --git a/src/fstring.cpp b/src/fstring.cpp
index 0b5a970..f71d6c1 100644
--- a/src/fstring.cpp
+++ b/src/fstring.cpp
@@ -12,7 +12,7 @@ template<> bool Bu::__cmpHashKeys<Bu::FString>(
         return a == b;
 }
 
-std::ostream& operator<< (std::ostream &os, Bu::FString &val )
+std::basic_ostream<char>& operator<< (std::basic_ostream<char> &os, const Bu::FString &val )
 {
         os.write( val.getStr(), val.getSize() );
         return os;