diff --git a/winsup/cygwin/sched.cc b/winsup/cygwin/sched.cc
index 71a1e868f..22ff0c8e8 100644
--- a/winsup/cygwin/sched.cc
+++ b/winsup/cygwin/sched.cc
@@ -140,7 +140,10 @@ int
 sched_getscheduler (pid_t pid)
 {
   if (pid < 0)
-    return ESRCH;
+    {
+      set_errno (EINVAL);
+      return -1;
+    }
   else
     return SCHED_FIFO;
 }