diff --git a/dlib/test/dnn.cpp b/dlib/test/dnn.cpp
index fd5bc05c5..8e0d52ae8 100644
--- a/dlib/test/dnn.cpp
+++ b/dlib/test/dnn.cpp
@@ -1193,7 +1193,7 @@ namespace
         }
         {
             print_spinner();
-            fc_<5,FC_NO_BIAS> l;
+            fc_<4,FC_NO_BIAS> l;
             DLIB_TEST_MSG(test_layer(l), test_layer(l));
         }
         {