diff --git a/am/src/riscv/nemu/trap.S b/am/src/riscv/nemu/trap.S
index 5ec275a..05d4957 100644
--- a/am/src/riscv/nemu/trap.S
+++ b/am/src/riscv/nemu/trap.S
@@ -31,7 +31,7 @@ f(30) f(31)
 #define PUSH(n) STORE concat(x, n), (n * XLEN)(sp);
 #define POP(n)  LOAD  concat(x, n), (n * XLEN)(sp);
 
-#define CONTEXT_SIZE  ((NR_REGS + 3 + 1) * XLEN)
+#define CONTEXT_SIZE  ((NR_REGS + 3) * XLEN)
 #define OFFSET_SP     ( 2 * XLEN)
 #define OFFSET_CAUSE  ((NR_REGS + 0) * XLEN)
 #define OFFSET_STATUS ((NR_REGS + 1) * XLEN)