diff --git a/c/blake3_sse2_x86-64_windows_msvc.asm b/c/blake3_sse2_x86-64_windows_msvc.asm
index d8a29f3..e649a25 100644
--- a/c/blake3_sse2_x86-64_windows_msvc.asm
+++ b/c/blake3_sse2_x86-64_windows_msvc.asm
@@ -2398,9 +2398,9 @@ CMP_MSB_MASK:
         dd 8 dup(80000000H)
 
 PBLENDW_0xCC_MASK:
-       dd 00000000H, FFFFFFFFH, 00000000H, FFFFFFFFH
+       dd 000000000H, 0FFFFFFFFH, 000000000H, 0FFFFFFFFH
 PBLENDW_0xC0_MASK:
-       dd 00000000H, 00000000H, 00000000H, FFFFFFFFH
+       dd 000000000H, 000000000H, 000000000H, 0FFFFFFFFH
 
 _RDATA ENDS
 END