diff --git a/compat.h b/compat.h
index 5822a6c4e..fa5329dcc 100644
--- a/compat.h
+++ b/compat.h
@@ -131,16 +131,6 @@
 #define MAX(a,b) (((a)>(b))?(a):(b))
 #endif
 
-/*
- * Emulate seteuid() for AIX via setuidx() -- needed for some versions of AIX
- */
-#ifdef _AIX
-#  include <sys/id.h>
-#  define seteuid(_EUID)	(setuidx(ID_EFFECTIVE|ID_REAL, _EUID))
-#  undef HAVE_SETEUID
-#  define HAVE_SETEUID		1
-#endif /* _AIX */
-
 /*
  * Emulate seteuid() for HP-UX via setresuid(2) and seteuid(2) for others.
  */