diff --git a/src/mainapp.cpp b/src/mainapp.cpp
index 14d352f..bde3f23 100644
--- a/src/mainapp.cpp
+++ b/src/mainapp.cpp
@@ -27,4 +27,6 @@
     UBootEnvMgr uBootEnvMgr(io, server, conn);
 
     io.run();
+
+    return 0;
 }