diff --git a/userspace/libraries/LibC/arch/x86_64/setjmp.S b/userspace/libraries/LibC/arch/x86_64/setjmp.S
index bd6ed239..bc48b2e7 100644
--- a/userspace/libraries/LibC/arch/x86_64/setjmp.S
+++ b/userspace/libraries/LibC/arch/x86_64/setjmp.S
@@ -48,7 +48,7 @@ sigsetjmp:
 
 	subq $8, %rsp
 	movq %rdi, (%rsp)
-	leaq 72(%rsi), %rdx
+	leaq 72(%rdi), %rdx
 	xorq %rsi, %rsi
 	call pthread_sigmask
 	movq (%rsp), %rdi