diff --git a/src/morethantext/error.rs b/src/morethantext/error.rs
index c8d6a46..7ab1497 100644
--- a/src/morethantext/error.rs
+++ b/src/morethantext/error.rs
@@ -41,7 +41,10 @@ impl Generic {
         }
     }
 
-    fn add_source<E: Into<MTTError>>(&mut self, source: E) {
+    fn add_source<E>(&mut self, source: E)
+    where
+        E: Into<MTTError>,
+    {
         self.source = Some(Arc::new(source.into()));
     }
 }