diff --git a/source/net/sourceforge/filebot/ui/analyze/TypeTool.java b/source/net/sourceforge/filebot/ui/analyze/TypeTool.java
index 0d9c9768..20da771f 100644
--- a/source/net/sourceforge/filebot/ui/analyze/TypeTool.java
+++ b/source/net/sourceforge/filebot/ui/analyze/TypeTool.java
@@ -49,7 +49,7 @@ class TypeTool extends Tool<TreeModel> {
 		
 		for (Iterator<File> iterator = sourceModel.fileIterator(); iterator.hasNext();) {
 			File file = iterator.next();
-			String extension = FileUtilities.getExtension(file);
+			String extension = FileUtilities.getExtension(file).toLowerCase();
 			
 			List<File> files = map.get(extension);