diff --git a/kernel/amd64/syscallentry.S b/kernel/amd64/syscallentry.S
index 6c6c695..5d26a12 100644
--- a/kernel/amd64/syscallentry.S
+++ b/kernel/amd64/syscallentry.S
@@ -37,7 +37,7 @@ amd64_syscall_entry:
 
   movq %rbp, %rsp
 
-  popq %rax; movq %rax, %cr3
+  popq %rbx; movq %rbx, %cr3
 
   pop_regs_skip_rax