diff --git a/ftdetect/turtle.vim b/ftdetect/turtle.vim
index 4d5923b..0bec6f9 100644
--- a/ftdetect/turtle.vim
+++ b/ftdetect/turtle.vim
@@ -1 +1 @@
-au BufRead,BufNewFile *.ttl set filetype=rdf-turtle
+au BufRead,BufNewFile *.ttl set filetype=rdf_turtle
diff --git a/syntax/rdf-turtle.vim b/syntax/rdf_turtle.vim
similarity index 100%
rename from syntax/rdf-turtle.vim
rename to syntax/rdf_turtle.vim