diff --git a/artiq/firmware/libboard_misoc/riscv32/vectors.S b/artiq/firmware/libboard_misoc/riscv32/vectors.S
index 19b6c5c3f..ea83ab53c 100644
--- a/artiq/firmware/libboard_misoc/riscv32/vectors.S
+++ b/artiq/firmware/libboard_misoc/riscv32/vectors.S
@@ -129,8 +129,6 @@ _abs_start:
     restores caller saved registers and then returns.
 */
 .global _start_trap
-/* Make it .weak so PAC/HAL can provide their own if needed. */
-.weak _start_trap
 
 _start_trap:
     addi sp, sp, -16*REGBYTES