diff --git a/common/jpeg/simd/jcclrss2-64.asm b/common/jpeg/simd/jcclrss2-64.asm
index ca7e24a..f2cd8f4 100644
--- a/common/jpeg/simd/jcclrss2-64.asm
+++ b/common/jpeg/simd/jcclrss2-64.asm
@@ -361,7 +361,7 @@
 
 	psllw     xmm7,BYTE_BIT
 	por       xmm5,xmm7		; xmm5=Cb
-	movdqa    XMMWORD [ebx], xmm5	; Save Cb
+	movdqa    XMMWORD [rbx], xmm5	; Save Cb
 
 	movdqa    xmm0, XMMWORD [wk(3)]	; xmm0=BO
 	movdqa    xmm6, XMMWORD [wk(2)]	; xmm6=BE