diff --git a/gstreamer/src/caps.rs b/gstreamer/src/caps.rs
index b5b4724f6..aca3defde 100644
--- a/gstreamer/src/caps.rs
+++ b/gstreamer/src/caps.rs
@@ -40,7 +40,7 @@ impl GstRc<CapsRef> {
 
     pub fn new_simple(name: &str, values: &[(&str, &ToValue)]) -> Self {
         assert_initialized_main_thread!();
-        let caps = Caps::new_empty();
+        let mut caps = Caps::new_empty();
 
         let structure = Structure::new(name, values);
         caps.get_mut().unwrap().append_structure(structure);
diff --git a/tutorials/src/bin/basic-tutorial-4.rs b/tutorials/src/bin/basic-tutorial-4.rs
index eeafcd93b..228a04766 100644
--- a/tutorials/src/bin/basic-tutorial-4.rs
+++ b/tutorials/src/bin/basic-tutorial-4.rs
@@ -125,7 +125,7 @@ fn handle_message(custom_data: &mut CustomData, msg: &gst::GstRc<gst::MessageRef
 
             custom_data.playing = new_state == gst::State::Playing;
             if custom_data.playing {
-                let query = gst::Query::new_seeking(gst::Format::Time);
+                let mut query = gst::Query::new_seeking(gst::Format::Time);
                 if custom_data.playbin.query(query.get_mut().unwrap()) {
                     match query.view() {
                         gst::QueryView::Seeking(seek) => {