diff --git a/libgo/runtime/go-nosys.c b/libgo/runtime/go-nosys.c
index 154f6b1..30222df 100644
--- a/libgo/runtime/go-nosys.c
+++ b/libgo/runtime/go-nosys.c
@@ -506,7 +506,7 @@
 
 #ifndef HAVE_SYSCALL
 int
-syscall(int number, ...)
+syscall(int number __attribute__ ((unused)), ...)
 {
   errno = ENOSYS;
   return -1;