diff --git a/firmware/fw_base.S b/firmware/fw_base.S
index 9f5a22f8..87e4406e 100644
--- a/firmware/fw_base.S
+++ b/firmware/fw_base.S
@@ -757,7 +757,7 @@ memcmp:
 	.globl _trap_handler
 	.globl _trap_exit
 _trap_handler:
-	sfence.vma
+	sfence.vma	zero, t0
 
 	TRAP_SAVE_AND_SETUP_SP_T0