diff --git a/cpp/src/arrow/array.h b/cpp/src/arrow/array.h
index 83cda33d1a6d0..afbd780dd3ad5 100644
--- a/cpp/src/arrow/array.h
+++ b/cpp/src/arrow/array.h
@@ -86,8 +86,7 @@ struct Decimal;
 struct ARROW_EXPORT ArrayData {
   ArrayData() : length(0) {}
 
-  ArrayData(
-      const std::shared_ptr<DataType>& type, int64_t length,
+  ArrayData(const std::shared_ptr<DataType>& type, int64_t length,
             int64_t null_count = kUnknownNullCount, int64_t offset = 0)
       : type(type), length(length), null_count(null_count), offset(offset) {}