diff --git a/simd/jsimdext.inc b/simd/jsimdext.inc
index 5beceb34..4ea3d17c 100644
--- a/simd/jsimdext.inc
+++ b/simd/jsimdext.inc
@@ -313,9 +313,17 @@ const_base:
 	mov r15, [rax+56]
 	push rsi
 	push rdi
+	sub     rsp, SIZEOF_XMMWORD
+	movlpd  XMMWORD [rsp], xmm6
+	sub     rsp, SIZEOF_XMMWORD
+	movlpd  XMMWORD [rsp], xmm7
 %endmacro
 
 %imacro uncollect_args 0
+	movlpd  xmm7, XMMWORD [rsp]
+	add     rsp, SIZEOF_XMMWORD
+	movlpd  xmm6, XMMWORD [rsp]
+	add     rsp, SIZEOF_XMMWORD
 	pop rdi
 	pop rsi
 	pop r15