diff --git a/am/src/nemu/isa/riscv/boot/start.S b/am/src/nemu/isa/riscv/boot/start.S
index d3ae78dda40e70ab8487ed6879056220c82f85ec..e5f9baeed4359959a5040f456438acd150cb4180 100644
--- a/am/src/nemu/isa/riscv/boot/start.S
+++ b/am/src/nemu/isa/riscv/boot/start.S
@@ -31,11 +31,13 @@
 
 _start:
   init_regs
-  init_fregs
 
   mv s0, zero
   la sp, _stack_pointer
   li a0, MSTATUS_FS & (MSTATUS_FS >> 1)
   csrs mstatus, a0
   csrwi fcsr, 0
+
+  init_fregs # init fregs after fp enable
+
   jal _trm_init