diff --git a/cpp/src/arrow/adapters/orc/adapter.cc b/cpp/src/arrow/adapters/orc/adapter.cc
index 2ce4356dffa4..057bed2a70f3 100644
--- a/cpp/src/arrow/adapters/orc/adapter.cc
+++ b/cpp/src/arrow/adapters/orc/adapter.cc
@@ -444,10 +444,6 @@ class ORCFileReader::Impl {
     return Status::OK();
   }
 
-  liborc::Reader* ORCFileReader::GetRawORCReader() {
-    return impl_->GetRawORCReader();
-  }
-
   Status NextStripeReader(int64_t batch_size, std::shared_ptr<RecordBatchReader>* out) {
     return NextStripeReader(batch_size, {}, out);
   }
@@ -463,6 +459,10 @@ ORCFileReader::ORCFileReader() { impl_.reset(new ORCFileReader::Impl()); }
 
 ORCFileReader::~ORCFileReader() {}
 
+liborc::Reader* ORCFileReader::GetRawORCReader() {
+  return impl_->GetRawORCReader();
+}
+
 Status ORCFileReader::Open(const std::shared_ptr<io::RandomAccessFile>& file,
                            MemoryPool* pool, std::unique_ptr<ORCFileReader>* reader) {
   return Open(file, pool).Value(reader);
diff --git a/cpp/src/arrow/adapters/orc/adapter.h b/cpp/src/arrow/adapters/orc/adapter.h
index a38683776bbe..f41cdf6c1b8b 100644
--- a/cpp/src/arrow/adapters/orc/adapter.h
+++ b/cpp/src/arrow/adapters/orc/adapter.h
@@ -29,6 +29,7 @@
 #include "arrow/type_fwd.h"
 #include "arrow/util/macros.h"
 #include "arrow/util/visibility.h"
+#include "arrow/adapters/orc/adapter_util.h"
 
 namespace arrow {
 namespace adapters {