diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 15de6f8d3d2f896d00b7bac93af4b302dc31d734..af0bb3565cecc8f6720f5adb593fc0e43b6223aa 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -411,7 +411,7 @@ static int sys_inotify_init1(int flags)
 #endif
 #define __NR_sys_ppoll __NR_ppoll
 _syscall5(int, sys_ppoll, struct pollfd *, fds, nfds_t, nfds,
-          struct timespec *, timeout, const __sigset_t *, sigmask,
+          struct timespec *, timeout, const sigset_t *, sigmask,
           size_t, sigsetsize)
 #endif
 
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index fdf9a475954740c33192cb27b26b9ebc6886fcb0..69c3982ee655d7276ecfe7975147e2fcdf75f45e 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -2552,12 +2552,26 @@ struct target_timer_t {
     abi_ulong ptr;
 };
 
+#define TARGET_SIGEV_MAX_SIZE 64
+
+/* This is architecture-specific but most architectures use the default */
+#ifdef TARGET_MIPS
+#define TARGET_SIGEV_PREAMBLE_SIZE (sizeof(int32_t) * 2 + sizeof(abi_long))
+#else
+#define TARGET_SIGEV_PREAMBLE_SIZE (sizeof(int32_t) * 2 \
+                                    + sizeof(target_sigval_t))
+#endif
+
+#define TARGET_SIGEV_PAD_SIZE ((TARGET_SIGEV_MAX_SIZE \
+                                - TARGET_SIGEV_PREAMBLE_SIZE) \
+                               / sizeof(int32_t))
+
 struct target_sigevent {
     target_sigval_t sigev_value;
     int32_t sigev_signo;
     int32_t sigev_notify;
     union {
-        int32_t _pad[ARRAY_SIZE(((struct sigevent *)0)->_sigev_un._pad)];
+        int32_t _pad[TARGET_SIGEV_PAD_SIZE];
         int32_t _tid;
 
         struct {