diff --git a/openface/data.py b/openface/data.py
index a939101..7a8ae7c 100644
--- a/openface/data.py
+++ b/openface/data.py
@@ -104,7 +104,7 @@ def iterImgs(directory):
     """
     assert directory is not None
 
-    exts = [".jpg", ".png"]
+    exts = [".jpg", ".png", ".JPG", ".PNG"]
 
     for subdir, dirs, files in os.walk(directory):
         for path in files: