diff --git a/ChocolArm64/Memory/CompareExchange128.cs b/ChocolArm64/Memory/CompareExchange128.cs
index 43698dd841..3ac14c6f13 100644
--- a/ChocolArm64/Memory/CompareExchange128.cs
+++ b/ChocolArm64/Memory/CompareExchange128.cs
@@ -32,7 +32,7 @@ namespace ChocolArm64.Memory
                 0x49, 0x89, 0xD3,             // mov  r11, rdx
                 0x49, 0x8B, 0x49, 0x08,       // mov  rcx, [r9+8]
                 0x49, 0x8B, 0x50, 0x08,       // mov  rdx, [r8+8]
-                0xF0, 0x49, 0x0F, 0xC7, 0x0B, // lock cmpxchg10x6b [r11]
+                0xF0, 0x49, 0x0F, 0xC7, 0x0B, // lock cmpxchg16b [r11]
                 0x49, 0x89, 0x02,             // mov  [r10], rax
                 0x4C, 0x89, 0xD0,             // mov  rax, r10
                 0x49, 0x89, 0x52, 0x08,       // mov  [r10+8], rdx