diff --git a/am/src/riscv/nemu/start.S b/am/src/riscv/nemu/start.S
index 3e56e5c..635289b 100644
--- a/am/src/riscv/nemu/start.S
+++ b/am/src/riscv/nemu/start.S
@@ -6,3 +6,5 @@ _start:
   mv s0, zero
   la sp, _stack_pointer
   jal _trm_init
+
+.size _start, . - _start