diff --git a/doc/reference/clutter/Makefile.am b/doc/reference/clutter/Makefile.am
index e396ad68d..1deacfc27 100644
--- a/doc/reference/clutter/Makefile.am
+++ b/doc/reference/clutter/Makefile.am
@@ -29,7 +29,7 @@ SCAN_OPTIONS=--deprecated-guards="CLUTTER_DISABLE_DEPRECATED"
 
 # 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=clutter
 
 # Extra options to supply to gtkdoc-mktmpl
 # e.g. MKTMPL_OPTIONS=--only-section-tmpl
diff --git a/doc/reference/cogl/Makefile.am b/doc/reference/cogl/Makefile.am
index 892d3436c..0d08a36db 100644
--- a/doc/reference/cogl/Makefile.am
+++ b/doc/reference/cogl/Makefile.am
@@ -29,7 +29,7 @@ SCAN_OPTIONS=--deprecated-guards="COGL_DISABLE_DEPRECATED"
 
 # 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=cogl
 
 # Extra options to supply to gtkdoc-mktmpl
 # e.g. MKTMPL_OPTIONS=--only-section-tmpl