diff --git a/am/src/nemu/isa/riscv/boot/start.S b/am/src/nemu/isa/riscv/boot/start.S
index 3e56e5c0..7749cb2c 100644
--- a/am/src/nemu/isa/riscv/boot/start.S
+++ b/am/src/nemu/isa/riscv/boot/start.S
@@ -2,7 +2,12 @@
 .globl _start
 .type _start, @function
 
+#define MSTATUS_FS 0x00006000
+
 _start:
   mv s0, zero
   la sp, _stack_pointer
+  li a0, MSTATUS_FS & (MSTATUS_FS >> 1)
+  csrs mstatus, a0
+  csrwi fcsr, 0
   jal _trm_init