diff --git a/arch/arm/src/tiva/common/tiva_sock_can.c b/arch/arm/src/tiva/common/tiva_sock_can.c
index 60ebd03e785bb..8c442d03dcae2 100644
--- a/arch/arm/src/tiva/common/tiva_sock_can.c
+++ b/arch/arm/src/tiva/common/tiva_sock_can.c
@@ -1263,6 +1263,7 @@ static int tivacan_alloc_fifo(struct net_driver_s *dev, int depth)
   if (free_fifo_idx < 0)
     {
       canwarn("Max number of filters allocated.\n");
+      nxmutex_unlock(&canmod->fifo_lock);
       return -ENOMEM;
     }