diff --git a/common/flatpak-json-oci-private.h b/common/flatpak-json-oci-private.h
index f732025a4..f20e88e38 100644
--- a/common/flatpak-json-oci-private.h
+++ b/common/flatpak-json-oci-private.h
@@ -222,6 +222,7 @@ void             flatpak_oci_image_set_os (FlatpakOciImage *image,
                                            const char      *os);
 void             flatpak_oci_image_set_layers (FlatpakOciImage *image,
                                                const char     **layers);
+int              flatpak_oci_image_get_n_layers (FlatpakOciImage *image);
 void             flatpak_oci_image_set_layer (FlatpakOciImage *image,
                                               const char      *layer);
 GHashTable *     flatpak_oci_image_get_labels (FlatpakOciImage *self);
diff --git a/common/flatpak-json-oci.c b/common/flatpak-json-oci.c
index 6b79de975..95c0acfff 100644
--- a/common/flatpak-json-oci.c
+++ b/common/flatpak-json-oci.c
@@ -720,6 +720,12 @@ flatpak_oci_image_set_layers (FlatpakOciImage *image,
   image->rootfs.diff_ids = g_strdupv ((char **) layers);
 }
 
+int
+flatpak_oci_image_get_n_layers (FlatpakOciImage *image)
+{
+  return ptrv_count ((gpointer *) image->rootfs.diff_ids);
+}
+
 GHashTable *
 flatpak_oci_image_get_labels (FlatpakOciImage *self)
 {