diff --git a/openwrtbuilder b/openwrtbuilder
index e0ce138..7e57e7f 100755
--- a/openwrtbuilder
+++ b/openwrtbuilder
@@ -651,8 +651,10 @@ fromSource() {
     sed -i '/CONFIG_TARGET_ROOTFS_/d' "$SEED_FILE"
     config_opts+=("CONFIG_TARGET_PER_DEVICE_ROOTFS=n")
     if [[ $FILESYSTEM == "squashfs" ]]; then
+        config_opts+=("CONFIG_TARGET_ROOTFS_EXT4FS=n")
         config_opts+=("CONFIG_TARGET_ROOTFS_SQUASHFS=y")
     elif [[ $FILESYSTEM == "ext4" ]]; then
+        config_opts+=("CONFIG_TARGET_ROOTFS_SQUASHFS=n")
         config_opts+=("CONFIG_TARGET_ROOTFS_EXT4FS=y")
     fi