diff --git a/artiq/compiler/transforms/int_monomorphizer.py b/artiq/compiler/transforms/int_monomorphizer.py
index 397988792..94711a43a 100644
--- a/artiq/compiler/transforms/int_monomorphizer.py
+++ b/artiq/compiler/transforms/int_monomorphizer.py
@@ -28,6 +28,8 @@ class IntMonomorphizer(algorithm.Visitor):
                 node.type["width"].unify(types.TValue(width))
 
     def visit_CallT(self, node):
+        self.generic_visit(node)
+
         if types.is_builtin(node.func.type, "int") or \
                 types.is_builtin(node.func.type, "round"):
             typ = node.type.find()