diff --git a/crates/vst3-host/tests/editor_main_thread.rs b/crates/vst3-host/tests/editor_main_thread.rs
index ab5d28c3..b6fbaa50 100644
--- a/crates/vst3-host/tests/editor_main_thread.rs
+++ b/crates/vst3-host/tests/editor_main_thread.rs
@@ -9,7 +9,12 @@ fn main() {
     let dir = common::fixture_dir();
     let gain = soundcraft_vst3_host::scan_paths(&[dir.to_path_buf()]).into_iter().find(|d| d.name == "Fixture Gain").expect("fixture").id;
     let mut p = soundcraft_vst3_host::instantiate_plugin(&gain).expect("instantiate");
-    assert_eq!(p.editor_size(), Ok((320, 240)));
+    // Editor windows are hosted on macOS only; elsewhere the probe reports "unsupported".
+    if cfg!(target_os = "macos") {
+        assert_eq!(p.editor_size(), Ok((320, 240)));
+    } else {
+        assert!(p.editor_size().is_err());
+    }
     let mut ed = soundcraft_dsp::Plugin::editor(&mut p).expect("editor handle");
     assert!(!ed.is_open());
     assert_eq!(ed.idle().len(), 1, "the fixture's setup edit");
diff --git a/crates/vst3-host/tests/fixture_e2e.rs b/crates/vst3-host/tests/fixture_e2e.rs
index 23970d2c..e3603b7a 100644
--- a/crates/vst3-host/tests/fixture_e2e.rs
+++ b/crates/vst3-host/tests/fixture_e2e.rs
@@ -212,7 +212,12 @@ fn state_saves_component_and_controller_and_restores_them() {
 fn editor_view_is_probed_and_edits_come_back_as_plain_values() {
     let id = id_of("Fixture Gain");
     let mut p = soundcraft_vst3_host::instantiate_plugin(&id).unwrap();
-    assert_eq!(p.editor_size(), Ok((320, 240)));
+    // Editor windows are hosted on macOS only; elsewhere the probe reports "unsupported".
+    if cfg!(target_os = "macos") {
+        assert_eq!(p.editor_size(), Ok((320, 240)));
+    } else {
+        assert!(p.editor_size().is_err());
+    }
     let mut ed = soundcraft_dsp::Plugin::editor(&mut p).expect("editor handle");
     // The fixture "edits" Gain to 0.9 (normalized) when it gets the component handler.
     assert_eq!(ed.idle(), vec![("7".to_string(), 1.8)]);