diff --git a/include/swift/SIL/SILModule.h b/include/swift/SIL/SILModule.h
index 3be26d4e5ba69..77a087b21a524 100644
--- a/include/swift/SIL/SILModule.h
+++ b/include/swift/SIL/SILModule.h
@@ -395,9 +395,7 @@ class SILModule {
   /// Action to be executed for serializing the SILModule.
   ActionCallback SerializeSILAction;
 
-#ifndef NDEBUG
   BasicBlockNameMapType basicBlockNames;
-#endif
 
   SILModule(llvm::PointerUnion<FileUnit *, ModuleDecl *> context,
             Lowering::TypeConverter &TC, const SILOptions &Options,