diff --git a/velox/dwio/common/ReaderFactory.cpp b/velox/dwio/common/ReaderFactory.cpp
index dcb120aab907..56599c620fd9 100644
--- a/velox/dwio/common/ReaderFactory.cpp
+++ b/velox/dwio/common/ReaderFactory.cpp
@@ -31,7 +31,8 @@ ReaderFactoriesMap& readerFactories() {
 } // namespace
 
 bool registerReaderFactory(std::shared_ptr<ReaderFactory> factory) {
-  bool ok = readerFactories().insert({factory->fileFormat(), factory}).second;
+  [[maybe_unused]] const bool ok =
+      readerFactories().insert({factory->fileFormat(), factory}).second;
   // NOTE: re-enable this check after Prestissimo has updated dwrf registration.
 #if 0
   VELOX_CHECK(