--- a/quota.h
+++ b/quota.h
@@ -1,7 +1,6 @@
 #ifndef GUARD_QUOTA_H
 #define GUARD_QUOTA_H
 
-#include <sys/cdefs.h>
 #include <sys/types.h>
 #include <stdint.h>
 
@@ -182,6 +181,6 @@ enum {
 	#endif
 #endif
 
-long quotactl __P((int, const char *, qid_t, caddr_t));
+long quotactl (int, const char *, qid_t, caddr_t);
 
 #endif /* _QUOTA_ */
