diff --git a/sys/arm/conf/SIMICS b/sys/arm/conf/SIMICS
index 51efa148767f..537276d8ecf2 100644
--- a/sys/arm/conf/SIMICS
+++ b/sys/arm/conf/SIMICS
@@ -40,6 +40,7 @@ options 	SOFTUPDATES		#Enable FFS soft updates support
 options 	UFS_ACL			#Support for access control lists
 options 	UFS_DIRHASH		#Improve performance on big directories
 options 	MD_ROOT			#MD is a potential root device
+options		MD_ROOT_SIZE=65535
 options		ROOTDEVNAME=\"ufs:md0\"
 options 	NFSCLIENT		#Network Filesystem Client
 options 	NFSSERVER		#Network Filesystem Server