diff --git a/src/crypto/asm/win64/cn_main_loop.S b/src/crypto/asm/win64/cn_main_loop.S
index 3c4dc020b..63c3a8ba6 100644
--- a/src/crypto/asm/win64/cn_main_loop.S
+++ b/src/crypto/asm/win64/cn_main_loop.S
@@ -5,8 +5,8 @@
 .global cnv2_mainloop_ryzen_asm
 .global cnv2_mainloop_bulldozer_asm
 .global cnv2_double_mainloop_sandybridge_asm
-.global FN_PREFIX(cnv2_rwz_mainloop_asm)
-.global FN_PREFIX(cnv2_rwz_double_mainloop_asm)
+.global cnv2_rwz_mainloop_asm
+.global cnv2_rwz_double_mainloop_asm
 
 ALIGN(64)
 cnv2_mainloop_ivybridge_asm:
@@ -33,19 +33,13 @@ cnv2_double_mainloop_sandybridge_asm:
 	mov eax, 3735929054
 
 ALIGN(64)
-FN_PREFIX(cnv2_rwz_mainloop_asm):
-	sub rsp, 48
-	mov rcx, rdi
+cnv2_rwz_mainloop_asm:
 	#include "cn2/cnv2_rwz_main_loop.inc"
-	add rsp, 48
 	ret 0
 	mov eax, 3735929054
 
 ALIGN(64)
-FN_PREFIX(cnv2_rwz_double_mainloop_asm):
-	sub rsp, 48
-	mov rcx, rdi
+cnv2_rwz_double_mainloop_asm:
 	#include "cn2/cnv2_rwz_double_main_loop.inc"
-	add rsp, 48
 	ret 0
 	mov eax, 3735929054