1 files changed, 1 insertions, 1 deletions

diff --git a/src/fstring.h b/src/fstring.h
index 1f21b5f..f06c362 100644
--- a/src/fstring.h
+++ b/src/fstring.h
@@ -897,6 +897,6 @@ namespace Bu
 }
 
 #include <ostream>
-std::ostream& operator<< (std::ostream &os, Bu::FString &val );
+std::basic_ostream<char>& operator<< (std::basic_ostream<char> &os, const Bu::FString &val );
 
 #endif