diff --git a/mm/iob/Kconfig b/mm/iob/Kconfig
index aad4c6c401f..b7f72cd4410 100644
--- a/mm/iob/Kconfig
+++ b/mm/iob/Kconfig
@@ -35,7 +35,7 @@ config IOB_BUFSIZE
 config IOB_NCHAINS
 	int "Number of pre-allocated I/O buffer chain heads"
 	default 0 if !NET_READAHEAD && !NET_UDP_READAHEAD
-	default 8 if NET_READAHEAD || NET_UDP_READAHEAD
+	default IOB_NBUFFERS if NET_READAHEAD || NET_UDP_READAHEAD
 	---help---
 		These tiny nodes are used as "containers" to support queueing of
 		I/O buffer chains.  This will limit the number of I/O transactions