diff --git a/src/platform/linux/x11/mod.rs b/src/platform/linux/x11/mod.rs
index f18b986c..35472957 100644
--- a/src/platform/linux/x11/mod.rs
+++ b/src/platform/linux/x11/mod.rs
@@ -117,7 +117,7 @@ impl EventsLoop {
         }
     }
 
-    pub fn poll_events<F>(&self, mut callback: F)
+    pub fn poll_events<F>(&mut self, mut callback: F)
         where F: FnMut(Event)
     {
         let xlib = &self.display.xlib;