diff --git a/Duplicati/Library/Main/default_compressed_extensions.txt b/Duplicati/Library/Main/default_compressed_extensions.txt
index 922c4d338..307c94dd1 100644
--- a/Duplicati/Library/Main/default_compressed_extensions.txt
+++ b/Duplicati/Library/Main/default_compressed_extensions.txt
@@ -125,7 +125,6 @@
 .ots #OpenDocument Spreadsheet Template
 .ott #OpenDocument Text Document Template
 .pages #Apple iWork Document
-.pdf #Portable Document Format
 .pptx #Microsoft PowerPoint Presentation
 .pptm #Microsoft PowerPoint Presentation (macros enabled)
 .stw #OpenOffice.org Text Document Template