diff --git a/default-configs/microblaze-softmmu.mak b/default-configs/microblaze-softmmu.mak
index 4399b8b361..613edab742 100644
--- a/default-configs/microblaze-softmmu.mak
+++ b/default-configs/microblaze-softmmu.mak
@@ -2,3 +2,4 @@
 
 CONFIG_PTIMER=y
 CONFIG_PFLASH_CFI01=y
+CONFIG_SERIAL=y
diff --git a/default-configs/microblazeel-softmmu.mak b/default-configs/microblazeel-softmmu.mak
index ddc6bf4448..4b40fb21a5 100644
--- a/default-configs/microblazeel-softmmu.mak
+++ b/default-configs/microblazeel-softmmu.mak
@@ -2,3 +2,4 @@
 
 CONFIG_PTIMER=y
 CONFIG_PFLASH_CFI01=y
+CONFIG_SERIAL=y