diff --git a/libudev/docs/Makefile.am b/libudev/docs/Makefile.am
index 7cd17139123..46b8797203e 100644
--- a/libudev/docs/Makefile.am
+++ b/libudev/docs/Makefile.am
@@ -32,7 +32,7 @@ SCAN_OPTIONS=
 
 # Extra options to supply to gtkdoc-mkdb.
 # e.g. MKDB_OPTIONS=--sgml-mode --output-format=xml
-MKDB_OPTIONS=--sgml-mode --output-format=xml
+MKDB_OPTIONS=--sgml-mode --output-format=xml --name-space udev
 
 # Extra options to supply to gtkdoc-mktmpl
 # e.g. MKTMPL_OPTIONS=--only-section-tmpl