diff --git a/gtk4/Gir.toml b/gtk4/Gir.toml
index 0037f183a0fb..829f8a3dd828 100644
--- a/gtk4/Gir.toml
+++ b/gtk4/Gir.toml
@@ -544,6 +544,9 @@ status = "generate"
     name = "accelerator_parse"
     manual = true # to make use of gdk::Key
     [[object.function]]
+    name = "disable_portals"
+    assertion = "not-initialized"
+    [[object.function]]
     name = "disable_setlocale"
     assertion = "not-initialized"
     [[object.function]]
diff --git a/gtk4/src/auto/functions.rs b/gtk4/src/auto/functions.rs
index 86aa7f297f87..47b2d34f832f 100644
--- a/gtk4/src/auto/functions.rs
+++ b/gtk4/src/auto/functions.rs
@@ -39,7 +39,7 @@ pub fn check_version(
 #[cfg_attr(docsrs, doc(cfg(feature = "v4_18")))]
 #[doc(alias = "gtk_disable_portals")]
 pub fn disable_portals() {
-    assert_initialized_main_thread!();
+    assert_not_initialized!();
     unsafe {
         ffi::gtk_disable_portals();
     }