diff --git a/src/include/config.h b/src/include/config.h
index ed4cfe6fbc..def3874c13 100644
--- a/src/include/config.h
+++ b/src/include/config.h
@@ -38,7 +38,6 @@
 #define HAVE_SYSCONF
 
 #if defined(aix)
-#  undef HAVE_SYS_SELECT_H
 #  undef HAVE_ISINF
 #  define CLASS_CONFLICT 
 #  define DISABLE_XOPEN_NLS