diff --git a/src/pl/plpython/plpy_typeio.c b/src/pl/plpython/plpy_typeio.c
index 7c844c2b8a..9e4e9035f7 100644
--- a/src/pl/plpython/plpy_typeio.c
+++ b/src/pl/plpython/plpy_typeio.c
@@ -679,7 +679,7 @@ PLyList_FromArray(PLyDatumToOb *arg, Datum d)
 	/* Array dimensions and left bounds */
 	ndim = ARR_NDIM(array);
 	dims = ARR_DIMS(array);
-	Assert(ndim < MAXDIM);
+	Assert(ndim <= MAXDIM);
 
 	/*
 	 * We iterate the SQL array in the physical order it's stored in the