diff --git a/cpp/src/arrow/dataset/test_util_internal.h b/cpp/src/arrow/dataset/test_util_internal.h
index a6bc7afb8ff..ee73ebc5a48 100644
--- a/cpp/src/arrow/dataset/test_util_internal.h
+++ b/cpp/src/arrow/dataset/test_util_internal.h
@@ -2140,8 +2140,8 @@ class WriteFileSystemDatasetMixin : public MakeFileSystemDatasetMixin {
         actual_struct = std::dynamic_pointer_cast<Array>(struct_array);
       }
 
-      auto expected_struct = arrow::ArrayFromJSON(
-          struct_(expected_physical_schema_->fields()), file_contents->second);
+      auto expected_struct = ArrayFromJSON(struct_(expected_physical_schema_->fields()),
+                                           file_contents->second);
 
       AssertArraysEqual(*expected_struct, *actual_struct, /*verbose=*/true);
     }