diff --git a/numba_rvsdg/core/datastructures/flow_info.py b/numba_rvsdg/core/datastructures/flow_info.py
index f0e8a18..dbc3cb9 100644
--- a/numba_rvsdg/core/datastructures/flow_info.py
+++ b/numba_rvsdg/core/datastructures/flow_info.py
@@ -89,7 +89,7 @@ def build_basicblocks(self: "FlowInfo", end_offset=None) -> "SCFG":
             term_offset = _prev_inst_offset(end)
             if term_offset not in self.jump_insts:
                 # implicit jump
-                targets = (names[end],)
+                targets = [names[end],]
             else:
                 targets = [names[o] for o in self.jump_insts[term_offset]]
 
diff --git a/numba_rvsdg/core/datastructures/scfg.py b/numba_rvsdg/core/datastructures/scfg.py
index a60abbe..bd27dc2 100644
--- a/numba_rvsdg/core/datastructures/scfg.py
+++ b/numba_rvsdg/core/datastructures/scfg.py
@@ -398,7 +398,7 @@ def iterate_region(self, region_name, region_view=False):
         region_head = region.header if region_name is not self.meta_region else self.find_head()
 
         # initialise housekeeping datastructures
-        to_visit, seen = [region_head], set
+        to_visit, seen = [region_head], set()
         while to_visit:
             # get the next block_name on the list
             block_name = to_visit.pop(0)