diff --git a/15_arch_details.ipynb b/15_arch_details.ipynb
index 2189794..ee9d847 100644
--- a/15_arch_details.ipynb
+++ b/15_arch_details.ipynb
@@ -343,7 +343,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "encoder = create_body(resnet34, cut=-2)"
+    "encoder = create_body(resnet34(), cut=-2)"
    ]
   },
   {