diff --git a/mutter.doap b/mutter.doap
index ed0fe8cf1..7da770bef 100644
--- a/mutter.doap
+++ b/mutter.doap
@@ -24,6 +24,7 @@ environment.</description>
   <bug-database rdf:resource="http://bugzilla.gnome.org/browse.cgi?product=mutter" />
 
   <category rdf:resource="http://api.gnome.org/doap-extensions#core" />
+  <programming-language>C</programming-language>
 
   <maintainer>
     <foaf:Person>