Improve logger class.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/logger.h b/src/logger.h
index f67ec55d1..6fb9fe5d8 100644
--- a/src/logger.h
+++ b/src/logger.h
@@ -88,12 +88,12 @@ class Logger final
         /**
          * Enters a message in the log. The message will be timestamped.
          */
-        void log(std::string str);
+        void log(const std::string &str);
 
         /**
          * Enters debug message in the log. The message will be timestamped.
          */
-        void dlog(std::string str);
+        void dlog(const std::string &str);
 
         void setDebugLog(const bool n)
         { mDebugLog = n; }