diff --git a/cpp/src/arrow/array/util.cc b/cpp/src/arrow/array/util.cc
index 38aa3d0e4d4be..7f00d4a3fe44c 100644
--- a/cpp/src/arrow/array/util.cc
+++ b/cpp/src/arrow/array/util.cc
@@ -916,18 +916,17 @@ Result<std::shared_ptr<Array>> MakeEmptyArray(std::shared_ptr<DataType> type,
   return builder->Finish();
 }
 
-Result<std::shared_ptr<Array>> MakeMaskArray(const std::vector<int64_t> &indices, int64_t length,
-                                             MemoryPool* memory_pool) {
+Result<std::shared_ptr<Array>> MakeMaskArray(const std::vector<int64_t>& indices,
+                                             int64_t length, MemoryPool* memory_pool) {
   BooleanBuilder builder(memory_pool);
   RETURN_NOT_OK(builder.Resize(length));
 
   auto i = indices.begin();
-  for(int64_t builder_i = 0; builder_i < length; builder_i++) {
+  for (int64_t builder_i = 0; builder_i < length; builder_i++) {
     if (builder_i == *i) {
       builder.UnsafeAppend(true);
       i++;
-    }
-    else {
+    } else {
       builder.UnsafeAppend(false);
     }
   }
diff --git a/cpp/src/arrow/array/util.h b/cpp/src/arrow/array/util.h
index 0f01ba673e256..90f92d096d7c7 100644
--- a/cpp/src/arrow/array/util.h
+++ b/cpp/src/arrow/array/util.h
@@ -69,7 +69,6 @@ ARROW_EXPORT
 Result<std::shared_ptr<Array>> MakeEmptyArray(std::shared_ptr<DataType> type,
                                               MemoryPool* pool = default_memory_pool());
 
-
 /// \brief Create an Array representing a boolean mask
 ///
 /// The mask will have all elements set to false except for those
@@ -80,8 +79,9 @@ Result<std::shared_ptr<Array>> MakeEmptyArray(std::shared_ptr<DataType> type,
 /// \param[in] pool the memory pool to allocate memory from
 /// \return the resulting Array
 ARROW_EXPORT
-Result<std::shared_ptr<Array>> MakeMaskArray(const std::vector<int64_t> &indices, int64_t length,
-                                             MemoryPool* memory_pool = default_memory_pool());
+Result<std::shared_ptr<Array>> MakeMaskArray(
+    const std::vector<int64_t>& indices, int64_t length,
+    MemoryPool* memory_pool = default_memory_pool());
 /// @}
 
 namespace internal {