diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index 684b43e..eaeea2b 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -167,7 +167,7 @@
 int           utimes(const char*, const struct timeval tvp[2])                          269, 271
 
 # signals
-int     sigaction(int, const struct sigaction *, struct sigaction *)  67
+int     sigaction(int, const struct sigaction *, struct sigaction *)  -1,67,67
 int     sigprocmask(int, const sigset_t *, sigset_t *)  126
 int     __sigsuspend:sigsuspend(int unused1, int unused2, unsigned mask)  72
 int     __rt_sigaction:rt_sigaction (int sig, const struct sigaction *act, struct sigaction *oact, size_t sigsetsize)  174
@@ -175,6 +175,9 @@
 int     __rt_sigtimedwait:rt_sigtimedwait(const sigset_t *set, struct siginfo_t  *info, struct timespec_t  *timeout, size_t  sigset_size)  177
 int     sigpending(sigset_t *)  73
 
+# special stub for ARM, see arch-arm/bionic/sigaction.c
+int     __sigaction:sigaction(int, const struct sigaction *, struct sigaction *)  67,-1,-1
+
 # sockets
 int           socket(int, int, int)              281,-1
 int           socketpair(int, int, int, int*)    288,-1