diff --git a/dlibrary/dlibrary.py b/dlibrary/dlibrary.py
index bfe629a..94a2962 100755
--- a/dlibrary/dlibrary.py
+++ b/dlibrary/dlibrary.py
@@ -333,10 +333,10 @@ def check_extension(path, exts):
     return path.suffix.lower() in exts
 
 def is_pdf(path):
-    check_extension(path, ['.pdf'])
+    return check_extension(path, ['.pdf'])
 
 def is_image(path):
-    check_extension(path, IMAGE_FILE_EXTENSIONS)
+    return check_extension(path, IMAGE_FILE_EXTENSIONS)
 
 def ignoreable(path):
     return path.name in IGNOREABLE_FILES or check_extension(path, IGNOREABLE_EXTENSIONS)