5 files changed, 5 insertions, 0 deletions
diff --git a/src/widgets/desktop-widget.h b/src/widgets/desktop-widget.h
index 1bb10fc51..0102897e5 100644
--- a/src/widgets/desktop-widget.h
+++ b/src/widgets/desktop-widget.h
@@ -22,6 +22,7 @@
 #include "ui/view/view-widget.h"
 #include "ui/view/edit-widget-interface.h"
 
+#include <stddef.h>
 #include <sigc++/connection.h>
 
 // forward declaration
diff --git a/src/widgets/gradient-image.h b/src/widgets/gradient-image.h
index d0864b6e8..7b3854a02 100644
--- a/src/widgets/gradient-image.h
+++ b/src/widgets/gradient-image.h
@@ -19,6 +19,7 @@ class SPGradient;
 
 #include <glib.h>
 
+#include <stddef.h>
 #include <sigc++/connection.h>
 
 #define SP_TYPE_GRADIENT_IMAGE (sp_gradient_image_get_type ())
diff --git a/src/widgets/gradient-vector.h b/src/widgets/gradient-vector.h
index 9147f9cc1..012d4e9a3 100644
--- a/src/widgets/gradient-vector.h
+++ b/src/widgets/gradient-vector.h
@@ -17,6 +17,7 @@
 
 #include <glib.h>
 
+#include <stddef.h>
 #include <sigc++/connection.h>
 
 #include <gtk/gtkvbox.h>
diff --git a/src/widgets/sp-attribute-widget.h b/src/widgets/sp-attribute-widget.h
index 2703bd98a..617c5b012 100644
--- a/src/widgets/sp-attribute-widget.h
+++ b/src/widgets/sp-attribute-widget.h
@@ -14,6 +14,7 @@
 #define SEEN_DIALOGS_SP_ATTRIBUTE_WIDGET_H
 
 #include <glib.h>
+#include <stddef.h>
 #include <sigc++/connection.h>
 
 #define SP_TYPE_ATTRIBUTE_WIDGET (sp_attribute_widget_get_type ())
diff --git a/src/widgets/sp-color-notebook.cpp b/src/widgets/sp-color-notebook.cpp
index 8429434a6..174971555 100644
--- a/src/widgets/sp-color-notebook.cpp
+++ b/src/widgets/sp-color-notebook.cpp
@@ -22,6 +22,7 @@
 #include <cstring>
 #include <string>
 #include <cstdlib>
+#include <cstddef>
 #include <gtk/gtk.h>
 #include <glibmm/i18n.h>