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
diff --git a/common/jpeg/simd/jdsamss2-64.asm b/common/jpeg/simd/jdsamss2-64.asm
index 7df283e..143a97a 100644
--- a/common/jpeg/simd/jdsamss2-64.asm
+++ b/common/jpeg/simd/jdsamss2-64.asm
@@ -298,8 +298,8 @@
 	pslldq	xmm1,(SIZEOF_XMMWORD-2)
 	movdqa	xmm2,xmm1
 
-	pand	xmm1, XMMWORD [edx+1*SIZEOF_XMMWORD]
-	pand	xmm2, XMMWORD [edi+1*SIZEOF_XMMWORD]
+	pand	xmm1, XMMWORD [rdx+1*SIZEOF_XMMWORD]
+	pand	xmm2, XMMWORD [rdi+1*SIZEOF_XMMWORD]
 
 	movdqa	XMMWORD [wk(2)], xmm1	; xmm1=(-- -- -- -- -- -- -- 15)
 	movdqa	XMMWORD [wk(3)], xmm2	; xmm2=(-- -- -- -- -- -- -- 15)