diff --git a/examples/graph_alexnet.cpp b/examples/graph_alexnet.cpp
index 88e0d7e..79d02f6 100644
--- a/examples/graph_alexnet.cpp
+++ b/examples/graph_alexnet.cpp
@@ -43,6 +43,7 @@
     {
         // Parse arguments
         cmd_parser.parse(argc, argv);
+        cmd_parser.validate();
 
         // Consume common parameters
         common_params = consume_common_graph_parameters(common_opts);