diff --git a/gstreamer/src/caps.rs b/gstreamer/src/caps.rs
index aca3defde..b5b4724f6 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 mut caps = Caps::new_empty();
+        let caps = Caps::new_empty();
 
         let structure = Structure::new(name, values);
         caps.get_mut().unwrap().append_structure(structure);