diff --git a/build/lib/scripts/embassy-initramfs-module b/build/lib/scripts/embassy-initramfs-module
index 965f1aef2..2a2f08a07 100755
--- a/build/lib/scripts/embassy-initramfs-module
+++ b/build/lib/scripts/embassy-initramfs-module
@@ -31,7 +31,7 @@ local_mount_root()
 	modprobe ${FSTYPE}
 	checkfs ${ROOT} root "${FSTYPE}"
 
-	ROOTFLAGS="$(echo "${ROOTFLAGS}" | sed 's/subvol=\(next\|current\)//')"
+	ROOTFLAGS="$(echo "${ROOTFLAGS}" | sed 's/subvol=\(next\|current\)//' | sed 's/^-o *$//')"
 
 	if [ "${FSTYPE}" != "unknown" ]; then
 		mount -t ${FSTYPE} ${ROOTFLAGS} ${ROOT} ${rootmnt}