diff --git a/defaults/yacy.init b/defaults/yacy.init
index 6c82ffeb6..4a08e86f1 100644
--- a/defaults/yacy.init
+++ b/defaults/yacy.init
@@ -273,7 +273,7 @@ minimumGlobalDelta = 500
 # the following mime-types are a blacklist for indexing:
 # parser.mime.deny: specifies mime-types that shall not be indexed
 parser.mime.deny=
-parser.extensions.deny=pdf
+parser.extensions.deny=
 
 # Promotion Strings
 # These strings appear in the Web Mask of the YACY search client