diff --git a/picard/file.py b/picard/file.py
index 06fa73390..d0f281e03 100644
--- a/picard/file.py
+++ b/picard/file.py
@@ -561,7 +561,7 @@ class File(QtCore.QObject, Item):
         self._apply_additional_files_moves(moves)
 
     def _compile_move_additional_files_pattern(self, config):
-        patterns = config.setting["move_additional_files_pattern"]
+        patterns = config.setting["move_additional_files_pattern"].lower()
         pattern_regexes = set()
         for pattern in patterns.split():
             pattern = pattern.strip()
diff --git a/test/test_file.py b/test/test_file.py
index 05fdaa41b..e3cfb32e4 100644
--- a/test/test_file.py
+++ b/test/test_file.py
@@ -408,6 +408,5 @@ class FileAdditionalFilesPatternsTest(PicardTestCase):
             (re.compile('(?s:c.ver\\.jpg)\\Z', re.IGNORECASE), False),
             (re.compile('(?s:\\.h.dden.*)\\Z', re.IGNORECASE), True),
             (re.compile('(?s:.*\\.jpg)\\Z', re.IGNORECASE), False),
-            (re.compile('(?s:.*\\.JPG)\\Z', re.IGNORECASE), False)
         }
         self.assertEqual(f._compile_move_additional_files_pattern(config), expected)