diff --git a/src/arch/x86_64/context.asm b/src/arch/x86_64/context.asm
index 711cd27d..9282daed 100644
--- a/src/arch/x86_64/context.asm
+++ b/src/arch/x86_64/context.asm
@@ -30,6 +30,8 @@ arch_switchcontext:
 
 	swapgs
 
+        mov qword [rsp+32], 0x43
+
 	.noswap:
 
 	iretq