diff --git a/kdump-lib.sh b/kdump-lib.sh
index 91b3226..a48ff8a 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -250,7 +250,7 @@ kdump_get_persistent_dev()
 
 is_ostree()
 {
-	grep -q "ostree" /proc/cmdline
+	test -f /run/ostree-booted
 }
 
 # get ip address or hostname from nfs/ssh config value