diff --git a/libudev/docs/Makefile.am b/libudev/docs/Makefile.am
index 46b8797203..5229f0f450 100644
--- a/libudev/docs/Makefile.am
+++ b/libudev/docs/Makefile.am
@@ -15,7 +15,7 @@ DOC_MODULE=libudev
 #DOC_MODULE_VERSION=2
 
 # The top-level SGML file. You can change this if you want to.
-DOC_MAIN_SGML_FILE=$(DOC_MODULE)-docs.sgml
+DOC_MAIN_SGML_FILE=$(DOC_MODULE)-docs.xml
 
 # The directory containing the source code. Relative to $(srcdir).
 # gtk-doc will search all .c & .h files beneath here for inline comments
diff --git a/libudev/docs/libudev-docs.sgml b/libudev/docs/libudev-docs.xml
similarity index 100%
rename from libudev/docs/libudev-docs.sgml
rename to libudev/docs/libudev-docs.xml