diff --git a/doc/ommx_ecosystem/adapter.ipynb b/doc/ommx_ecosystem/adapter.ipynb
index b5a17afc..a2cb073a 100644
--- a/doc/ommx_ecosystem/adapter.ipynb
+++ b/doc/ommx_ecosystem/adapter.ipynb
@@ -99,6 +99,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "import ommx.v1\n",
+    "\n",
     "class OMMXxxxAdapter(SolverAdapter):\n",
     "\t\t...\n",
     "\t\tdef decode_to_state(self, data: SolverOutput) -> ommx.v1.State:\n",