diff --git a/Duplicati/Library/Main/default_compressed_extensions.txt b/Duplicati/Library/Main/default_compressed_extensions.txt
index 307c94dd1..7ffd586de 100644
--- a/Duplicati/Library/Main/default_compressed_extensions.txt
+++ b/Duplicati/Library/Main/default_compressed_extensions.txt
@@ -94,6 +94,7 @@
 .png #Portable Network Graphic
 .pspimage #PaintShopPro Image
 .tif #TIFF image
+.dng #Adobe Digital Negative
 
 
 # Compressed Font files