diff --git a/board/common/qemu/Config.in.in b/board/common/qemu/Config.in.in
index af6cd72e..131e92e2 100644
--- a/board/common/qemu/Config.in.in
+++ b/board/common/qemu/Config.in.in
@@ -108,10 +108,12 @@ config QEMU_RW
 	default "cfg.ext4"
 
 config QEMU_RW_VAR_OPT
-	bool "Separate writable /var (256MB)"
+	bool "Separate writable /var"
 
 if QEMU_RW_VAR_OPT
-
+config QEMU_RW_VAR_SIZE
+	string "Size of /var"
+	default "256M"
 config QEMU_RW_VAR
 	string "Writable /var layer"
 	default "var.ext4"
diff --git a/board/common/qemu/qemu.sh b/board/common/qemu/qemu.sh
index 6f524bd3..63e9688e 100755
--- a/board/common/qemu/qemu.sh
+++ b/board/common/qemu/qemu.sh
@@ -172,7 +172,7 @@ rw_args()
 
     if [ "$CONFIG_QEMU_RW_VAR_OPT" ]; then
 	if ! [ -f "$CONFIG_QEMU_RW_VAR" ]; then
-	    dd if=/dev/zero of="$CONFIG_QEMU_RW_VAR" bs=256M count=1 >/dev/null 2>&1
+	    dd if=/dev/zero of="$CONFIG_QEMU_RW_VAR" bs=$CONFIG_QEMU_RW_VAR_SIZE count=1 >/dev/null 2>&1
 	    mkfs.ext4 -L var "$CONFIG_QEMU_RW_VAR" >/dev/null 2>&1
 	fi