diff --git a/imgupload.py b/imgupload.py
index 5998d6d..6512a4b 100644
--- a/imgupload.py
+++ b/imgupload.py
@@ -17,7 +17,7 @@ app = Flask(__name__)  # app is the app
 
 
 def allowed_extension(testext):
-    if testext in settings.ALLOWED_EXTENSIONS:
+    if testext.lower() in settings.ALLOWED_EXTENSIONS:
         return True
     else:
         return False