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-rw-r--r--bits/ioctls.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/bits/ioctls.h b/bits/ioctls.h
index 3b6178bfae..d3ecad9515 100644
--- a/bits/ioctls.h
+++ b/bits/ioctls.h
@@ -1 +1,5 @@
+#ifndef _SYS_IOCTL_H
+# error "Never use <bits/ioctls.h> directly; include <sys/ioctl.h> instead."
+#endif
+
 /* This space intentionally left blank.  */