diff --git a/observer_agent/service/main.cpp b/observer_agent/service/main.cpp
index 940cf83c08f59e783a99e5b95e6bca20c0850c08..f177645ad19d0af655cfde2eec19ea496f0e62e5 100644
--- a/observer_agent/service/main.cpp
+++ b/observer_agent/service/main.cpp
@@ -51,7 +51,7 @@ static bool power_of_2(unsigned int num)
 {
     if (num == 0)
         return false;
-    if (num & (num - 1) != 0)
+    if ((num & (num - 1)) != 0)
         return false;
     return true;
 }