diff --git a/src/main.rs b/src/main.rs
index 86b754a..773245c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -384,9 +384,7 @@ fn eat_include<I: Iterator<Item = Token>>(
     } else {
         return Err((pos, "expected identifier"));
     };
-    let rules = mixin
-        .args(&args)
-        .call(super_selector)?;
+    let rules = mixin.args(&args).call(super_selector)?;
     Ok(rules)
 }
 
diff --git a/src/mixin.rs b/src/mixin.rs
index 4c64050..f24760e 100644
--- a/src/mixin.rs
+++ b/src/mixin.rs
@@ -38,7 +38,7 @@ impl Mixin {
         self
     }
 
-    pub fn call(&mut self, super_selector: &Selector,) -> Result<Vec<Stmt>, (Pos, &'static str)> {
+    pub fn call(&mut self, super_selector: &Selector) -> Result<Vec<Stmt>, (Pos, &'static str)> {
         self.eval(super_selector, &mut self.scope.clone())
     }