diff --git a/arch/x86/irq_pit.S b/arch/x86/irq_pit.S
index cc5f0f0..e0e596b 100644
--- a/arch/x86/irq_pit.S
+++ b/arch/x86/irq_pit.S
@@ -11,6 +11,8 @@
 pit_handler:         // already got eflags, cs and eip on stack thanks to CPU 
   pushl $0           // err_code     esp+12+7*4=40
   pushl %ebp
+  movl %esp, %ebp
+
   pushl %eax
   pushl %ecx
   pushl %edx