diff --git a/loopy/translation_unit.py b/loopy/translation_unit.py
index f690d99566e7380cdd83995b62da6866e1abb5ea..40b6b4765798214fa00cec1d6deb1fead71e1cc6 100644
--- a/loopy/translation_unit.py
+++ b/loopy/translation_unit.py
@@ -447,7 +447,7 @@ class CallablesIDCollector(CombineMapper):
         return callables_in_insn
 
     def map_type_cast(self, expr):
-        return self.rec(expr)
+        return self.rec(expr.child)
 
     map_variable = map_constant
     map_function_symbol = map_constant