diff --git a/src/assemblicon/highlevel/utils.py b/src/assemblicon/highlevel/utils.py
index 87c1ae7..22ef7a0 100644
--- a/src/assemblicon/highlevel/utils.py
+++ b/src/assemblicon/highlevel/utils.py
@@ -40,5 +40,5 @@ class MacCategory(enum.StrEnum):
     """Icons for file extensions"""
 
 
-DEFAULT_FD_THUMBNAIL_HWS: tuple[int, ...] = (16, 32, 48, 64, 128, 256)
+DEFAULT_FD_THUMBNAIL_HWS: tuple[int, ...] = (16, 32, 48, 64, 128, 256, 512)
 """The default collection of sizes for generating FreeDesktop icons."""