diff --git a/samples/main.cc b/samples/main.cc
index f16548b0..674f3c4 100644
--- a/samples/main.cc
+++ b/samples/main.cc
@@ -146,8 +146,7 @@
         std::cerr << "Unknown output format: " << args[i] << std::endl;
         return false;
       }
-    }
-    if (arg == "-o" || arg == "--output-name") {
+    } else if (arg == "-o" || arg == "--output-name") {
       ++i;
       if (i >= args.size()) {
         std::cerr << "Missing value for " << arg << std::endl;