diff --git a/python/port/genhdr/qstrdefs.in.h b/python/port/genhdr/qstrdefs.in.h
index 4319f3aee..6962c720b 100644
--- a/python/port/genhdr/qstrdefs.in.h
+++ b/python/port/genhdr/qstrdefs.in.h
@@ -248,7 +248,7 @@ Q(lstrip)
 Q(map)
 Q(math)
 Q(matplotlib)
-Q(matplotlib_dot_pyplot)
+Q(matplotlib.pyplot)
 Q(max)
 Q(maximum_space_recursion_space_depth_space_exceeded)
 Q(micropython)