diff --git a/src/util.cpp b/src/util.cpp
index 59e83bf..c6aedde 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -283,7 +283,7 @@
         {
             continue;
         }
-        interfaces.emplace_back(ifa->ifa_name);
+        interfaces.emplace(ifa->ifa_name);
     }
     return interfaces;
 }