diff --git a/internal/compiler/generator/cpp.rs b/internal/compiler/generator/cpp.rs
index 2ac74a81f83..549d3d29fdc 100644
--- a/internal/compiler/generator/cpp.rs
+++ b/internal/compiler/generator/cpp.rs
@@ -1712,7 +1712,7 @@ fn generate_sub_component(
             field_access,
             Declaration::Function(Function {
                 name: "visit_dynamic_children".into(),
-                signature: "(intptr_t dyn_index, [[maybe_unused]] slint::private_api::TraversalOrder order, [[maybe_unused]] slint::private_api::ItemVisitorRefMut visitor) const -> uint64_t".into(),
+                signature: "(uintptr_t dyn_index, [[maybe_unused]] slint::private_api::TraversalOrder order, [[maybe_unused]] slint::private_api::ItemVisitorRefMut visitor) const -> uint64_t".into(),
                 statements: Some(vec![
                     "    auto self = this;".to_owned(),
                     format!("    switch(dyn_index) {{ {} }};", children_visitor_cases.join("")),