diff --git a/iob_cache.py b/iob_cache.py
index aee304a..f15bb36 100755
--- a/iob_cache.py
+++ b/iob_cache.py
@@ -85,6 +85,7 @@ def _create_submodules_list(cls):
         super()._create_submodules_list(
             [
                 {"interface": "iob_s_port"},
+                {"interface": "iob_s_portmap"},
                 {"interface": "axi_m_port"},
                 {"interface": "axi_m_m_portmap"},
                 {"interface": "axi_m_write_port"},