diff --git a/lib/mongrel/mime_types.yml b/lib/mongrel/mime_types.yml
index 8d5111ca..3ce1739e 100644
--- a/lib/mongrel/mime_types.yml
+++ b/lib/mongrel/mime_types.yml
@@ -18,7 +18,7 @@
 .asp: text/asp
 .asr: video/x-ms-asf
 .asx: video/x-ms-asf
-.atom: application/xml+atom
+.atom: application/atom+xml
 .au: audio/basic
 .au: audio/x-au
 .avi: video/avi