diff --git a/overlays/oci-cli.nix b/overlays/oci-cli.nix
index 4e780dd..78a8a23 100644
--- a/overlays/oci-cli.nix
+++ b/overlays/oci-cli.nix
@@ -1,5 +1,5 @@
 self: super: {
   oci-cli = super.oci-cli.overrideAttrs(o: {
-    patches = o.patches ++ [ ./patches/oci.patch ];
+    patches = (o.patches or []) ++ [ ./patches/oci.patch ];
   });
 }