diff --git a/bsd-user/aarch64/target_arch_signal.h b/bsd-user/aarch64/target_arch_signal.h
index bff752a..b72ba7a 100644
--- a/bsd-user/aarch64/target_arch_signal.h
+++ b/bsd-user/aarch64/target_arch_signal.h
@@ -77,4 +77,6 @@
     target_ucontext_t   sf_uc;  /* saved ucontext */
 };
 
+#define TARGET_SIGSTACK_ALIGN 16
+
 #endif /* TARGET_ARCH_SIGNAL_H */