diff --git a/am/src/native/platform.c b/am/src/native/platform.c
index b282702..d17beac 100644
--- a/am/src/native/platform.c
+++ b/am/src/native/platform.c
@@ -48,6 +48,7 @@ static void save_example_context() {
 }
 
 static void setup_sigaltstack() {
+  assert(sizeof(thiscpu->sigstack) == SIGSTKSZ);
   stack_t ss;
   ss.ss_sp = thiscpu->sigstack;
   ss.ss_size = sizeof(thiscpu->sigstack);
diff --git a/am/src/native/platform.h b/am/src/native/platform.h
index f6f109d..58fe6e5 100644
--- a/am/src/native/platform.h
+++ b/am/src/native/platform.h
@@ -20,7 +20,7 @@ typedef struct {
   uintptr_t ksp;
   int cpuid;
   Event ev; // similar to cause register in mips/riscv
-  uint8_t sigstack[SIGSTKSZ];
+  uint8_t sigstack[8192];
 } __am_cpu_t;
 extern __am_cpu_t *__am_cpu_struct;
 #define thiscpu __am_cpu_struct