diff --git a/libgimp/gimp.h b/libgimp/gimp.h
index 1167a3e085..0578715da1 100644
--- a/libgimp/gimp.h
+++ b/libgimp/gimp.h
@@ -22,6 +22,7 @@
 #define __GIMP_H__
 
 #include <cairo.h>
+#include <glib-object.h>
 #include <gegl.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
 
diff --git a/libgimp/gimpui.h b/libgimp/gimpui.h
index 08e591b1b8..2d3db085e4 100644
--- a/libgimp/gimpui.h
+++ b/libgimp/gimpui.h
@@ -19,7 +19,9 @@
 #ifndef __GIMP_UI_H__
 #define __GIMP_UI_H__
 
+#include <gio/gio.h>
 #include <gtk/gtk.h>
+#include <libgimp/gimp.h>
 
 #include <libgimpwidgets/gimpwidgets.h>
 
diff --git a/libgimpmodule/gimpmodule.h b/libgimpmodule/gimpmodule.h
index 783b07dedf..d10a7a4a7c 100644
--- a/libgimpmodule/gimpmodule.h
+++ b/libgimpmodule/gimpmodule.h
@@ -22,6 +22,7 @@
 #ifndef __GIMP_MODULE_H__
 #define __GIMP_MODULE_H__
 
+#include <gio/gio.h>
 #include <gmodule.h>
 
 #define __GIMP_MODULE_H_INSIDE__