diff --git a/project.py b/project.py
index a8bcc25..c661d9b 100644
--- a/project.py
+++ b/project.py
@@ -798,9 +798,7 @@ class Project:
                     total += 1
                     cell_lib = m.group(1)
                     cell_name = m.group(2)
-                    cell_drive = m.group(3)
                     assert cell_lib in ["fd_sc_hd", "ef_sc_hd"]
-                    assert int(cell_drive) > 0
                     try:
                         cell_count[cell_name] += 1
                     except KeyError: