diff --git a/plugins/SliceInfoPlugin/SliceInfo.py b/plugins/SliceInfoPlugin/SliceInfo.py
index 977b9b809b..5ead422d0a 100755
--- a/plugins/SliceInfoPlugin/SliceInfo.py
+++ b/plugins/SliceInfoPlugin/SliceInfo.py
@@ -232,7 +232,7 @@ class SliceInfo(QObject, Extension):
                     if node.source_mime_type is None:
                         model["mime_type"] = ""
                     else:
-                        model["mime_type"] = node.source_mime_type
+                        model["mime_type"] = node.source_mime_type.name
 
                     data["models"].append(model)