diff --git a/src/examples/net_test_1.cpp b/src/examples/net_test_1.cpp
index 33451e6c3c02b1feeacfe9390699a8ac0935f21d..372fa3dcffb42800e10fed0eeb63f6e3be64e8b4 100644
--- a/src/examples/net_test_1.cpp
+++ b/src/examples/net_test_1.cpp
@@ -141,5 +141,10 @@ int main() {
     net.randomize_parameters();
     optimize_via_gradient_descent( net, mse );
 
+    /* Normalize data to prevent 'nan' results */
+    ds.normalize();
+    net.randomize_parameters();
+    optimize_via_gradient_descent(net, mse);
+
     return 0;
 }