diff --git a/doc/Makefile b/doc/Makefile
index 49d84e1..51ad75c 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -16,7 +16,7 @@ subdirs:
 gtkdoc/CPP.types:
 	./gtkdoc.sh -P "$(PREFIX)" -- "gtkdoc/CPP.types"
 
-gtkdoc/tmpl.stamp: gtkdoc/CPP.types
+gtkdoc/tmpl.stamp: gtkdoc/CPP.types gtkdoc/tmpl/cpp.sgml
 	./gtkdoc.sh -P "$(PREFIX)" -- "gtkdoc/tmpl.stamp"
 
 gtkdoc/sgml.stamp: gtkdoc/tmpl.stamp
diff --git a/doc/project.conf b/doc/project.conf
index c5ab9a1..4b4987b 100644
--- a/doc/project.conf
+++ b/doc/project.conf
@@ -9,7 +9,7 @@ script=./gtkdoc.sh
 [gtkdoc/tmpl.stamp]
 type=script
 script=./gtkdoc.sh
-depends=gtkdoc/CPP.types
+depends=gtkdoc/CPP.types,gtkdoc/tmpl/cpp.sgml
 
 [gtkdoc/sgml.stamp]
 type=script