diff --git a/kernel/base/core/los_bitmap.c b/kernel/base/core/los_bitmap.c
index 937084cd63d1829010fb72b7ce70f77a8a5ce50a..ae62a47c259a8453014d748a01733300776324e7 100644
--- a/kernel/base/core/los_bitmap.c
+++ b/kernel/base/core/los_bitmap.c
@@ -92,7 +92,7 @@ VOID LOS_BitmapSetNBits(UINTPTR *bitmap, UINT32 start, UINT32 numsSet)
     UINTPTR maskToSet = BITMAP_FIRST_WORD_MASK(start);
 
     while (numsSet > bitsToSet) {
-        *p |= bitsToSet;
+        *p |= maskToSet;
         numsSet -= bitsToSet;
         bitsToSet = BITMAP_BITS_PER_WORD;
         maskToSet = OS_BITMAP_WORD_MASK;