diff --git a/pokemontools/vba/vba.py b/pokemontools/vba/vba.py
index f6a0f7b..eafbaa1 100644
--- a/pokemontools/vba/vba.py
+++ b/pokemontools/vba/vba.py
@@ -85,7 +85,7 @@ def call(bank, address, vba=vba, registers=registers):
     else:
         registers["pc"] = address
 
-def get_stack():
+def get_stack(vba=vba, registers=registers):
     """
     Return a list of functions on the stack.
     """