diff --git a/reactos/ntoskrnl/include/internal/spinlock.h b/reactos/ntoskrnl/include/internal/spinlock.h
index 26cfa2db275..94bfe3da30b 100644
--- a/reactos/ntoskrnl/include/internal/spinlock.h
+++ b/reactos/ntoskrnl/include/internal/spinlock.h
@@ -75,7 +75,7 @@ KxAcquireSpinLock(IN PKSPIN_LOCK SpinLock)
         }
 #endif
     }
-#ifdef DBG
+#if DBG
     /* On debug builds, we OR in the KTHREAD */
     *SpinLock = (KSPIN_LOCK)KeGetCurrentThread() | 1;
 #endif