diff --git a/mm/iob/iob_alloc.c b/mm/iob/iob_alloc.c
index 9eb822b9867..5674948e2c9 100644
--- a/mm/iob/iob_alloc.c
+++ b/mm/iob/iob_alloc.c
@@ -96,7 +96,7 @@ static FAR struct iob_s *iob_alloc_committed(void)
       iob->io_len    = 0;    /* Length of the data in the entry */
       iob->io_offset = 0;    /* Offset to the beginning of data */
       iob->io_pktlen = 0;    /* Total length of the packet */
-#ifdef CONFIG_NET_TIMESTAMPING
+#ifdef CONFIG_NET_TIMESTAMP
       iob->io_conn   = NULL;
 #endif
     }
@@ -138,7 +138,7 @@ static FAR struct iob_s *iob_tryalloc_internal(bool throttled)
           iob->io_len    = 0;    /* Length of the data in the entry */
           iob->io_offset = 0;    /* Offset to the beginning of data */
           iob->io_pktlen = 0;    /* Total length of the packet */
-#ifdef CONFIG_NET_TIMESTAMPING
+#ifdef CONFIG_NET_TIMESTAMP
           iob->io_conn   = NULL;
 #endif
           return iob;