diff --git a/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py b/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py
index 4bfb70a0..5fe9bcb0 100644
--- a/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py
+++ b/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py
@@ -40,8 +40,8 @@ class BootimgEFIPlugin(SourcePlugin):
 
     name = 'bootimg-efi-isar'
 
-    @classmethod
-    def _copy_additional_files(cls, hdddir, initrd, dtb):
+    @staticmethod
+    def _copy_additional_files(hdddir, initrd, dtb):
         bootimg_dir = get_bitbake_var("DEPLOY_DIR_IMAGE")
         if not bootimg_dir:
             raise WicError("Couldn't find DEPLOY_DIR_IMAGE, exiting")