diff --git a/src/include/config.h b/src/include/config.h
index 5f937c91b31..ed4cfe6fbcb 100644
--- a/src/include/config.h
+++ b/src/include/config.h
@@ -39,7 +39,6 @@
 
 #if defined(aix)
 #  undef HAVE_SYS_SELECT_H
-#  undef HAVE_TERMIOS_H
 #  undef HAVE_ISINF
 #  define CLASS_CONFLICT 
 #  define DISABLE_XOPEN_NLS