diff --git a/Sources/Yams/Parser.swift b/Sources/Yams/Parser.swift
index 4ab11276..0c76e3ba 100644
--- a/Sources/Yams/Parser.swift
+++ b/Sources/Yams/Parser.swift
@@ -365,8 +365,7 @@ private extension Parser {
     }
 
     private func checkDuplicates(mappingKeys: [Node]) throws {
-        let duplicates: [Node: [Node]] = Dictionary(grouping: mappingKeys) { $0 }
-            .filter { $1.count > 1 }
+        let duplicates: [Node: [Node]] = Dictionary(grouping: mappingKeys) { $0 }.filter { $1.count > 1 }
         guard duplicates.isEmpty else {
             throw YamlError.duplicatedKeysInMapping(duplicates: duplicates, yaml: yaml)
         }