diff --git a/sys/auto_init/netif/auto_init_mrf24j40.c b/sys/auto_init/netif/auto_init_mrf24j40.c
index ca19ac68a399..de720fdc4d30 100644
--- a/sys/auto_init/netif/auto_init_mrf24j40.c
+++ b/sys/auto_init/netif/auto_init_mrf24j40.c
@@ -40,7 +40,7 @@
 
 static mrf24j40_t mrf24j40_devs[MRF24J40_NUM];
 static gnrc_netdev2_t gnrc_adpt[MRF24J40_NUM];
-static char _mrf24j40_stacks[MRF24J40_MAC_STACKSIZE][MRF24J40_NUM];
+static char _mrf24j40_stacks[MRF24J40_NUM][MRF24J40_MAC_STACKSIZE];
 
 void auto_init_mrf24j40(void)
 {