diff --git a/src/boot.s b/src/boot.s
index 95714b4..d97e40a 100644
--- a/src/boot.s
+++ b/src/boot.s
@@ -34,6 +34,7 @@ stack_top:
 _start:
     # Set up some space for a call stack. The stack grows downwards, so esp gets set to the top of the stack.
     movl $stack_top, %esp
+    movl %esp, %ebp
 
     # Very early initialization done here.
     call kearly