diff --git a/trapasm.S b/trapasm.S
index c0cfd8e..4ae023d 100644
--- a/trapasm.S
+++ b/trapasm.S
@@ -24,6 +24,7 @@ alltraps:
 trapret:
         push $kernel_lock
         call release_spinlock
+        addl $4, %esp
         popal
         popl %es
         popl %ds