diff --git a/Util/SimpleLogger.h b/Util/SimpleLogger.h
index f154b0e82..a234c9646 100644
--- a/Util/SimpleLogger.h
+++ b/Util/SimpleLogger.h
@@ -127,7 +127,7 @@ class SimpleLogger
         std::lock_guard<std::mutex> lock(get_mutex());
         if (!LogPolicy::GetInstance().IsMute())
         {
-            const bool is_terminal = isatty(fileno(stdout));
+            const bool is_terminal = ( 0 != isatty(fileno(stdout)) ? true : false);
             switch (level)
             {
             case logINFO: