diff --git a/libmproxy/console/__init__.py b/libmproxy/console/__init__.py
index fe75a0476..ba699d335 100644
--- a/libmproxy/console/__init__.py
+++ b/libmproxy/console/__init__.py
@@ -526,6 +526,7 @@ class ConsoleMaster(flow.FlowMaster):
 
     def spawn_external_viewer(self, data, contenttype):
         if contenttype:
+            contenttype = contenttype.split(";")[0]
             ext = mimetypes.guess_extension(contenttype) or ""
         else:
             ext = ""