diff --git a/include/llvm/MC/MCSchedule.h b/include/llvm/MC/MCSchedule.h
index 99afb10ebd3..af68a29c5e4 100644
--- a/include/llvm/MC/MCSchedule.h
+++ b/include/llvm/MC/MCSchedule.h
@@ -172,10 +172,10 @@ private:
   unsigned ProcID;
   const MCProcResourceDesc *ProcResourceTable;
   const MCSchedClassDesc *SchedClassTable;
-
+#ifndef NDEBUG
   unsigned NumProcResourceKinds;
   unsigned NumSchedClasses;
-
+#endif
   // Instruction itinerary tables used by InstrItineraryData.
   friend class InstrItineraryData;
   const InstrItinerary *InstrItineraries;