diff --git a/src/crypto/asm/cn_main_loop.S b/src/crypto/asm/cn_main_loop.S
index c2c08739a..347f0e088 100644
--- a/src/crypto/asm/cn_main_loop.S
+++ b/src/crypto/asm/cn_main_loop.S
@@ -68,6 +68,7 @@ ALIGN(64)
 FN_PREFIX(cnv2_rwz_double_mainloop_asm):
 	sub rsp, 48
 	mov rcx, rdi
+	mov rdx, rsi
 	#include "cn2/cnv2_rwz_double_main_loop.inc"
 	add rsp, 48
 	ret 0