5 files changed, 5 insertions, 5 deletions
diff --git a/src/ui/dialog/color-item.cpp b/src/ui/dialog/color-item.cpp
index 4ebee6834..61709f791 100644
--- a/src/ui/dialog/color-item.cpp
+++ b/src/ui/dialog/color-item.cpp
@@ -15,7 +15,7 @@
 #include "config.h"
 #endif
 
-#include <errno.h>
+#include <cerrno>
 
 #include <gtkmm/label.h>
 #include <glibmm/i18n.h>
diff --git a/src/ui/dialog/document-metadata.h b/src/ui/dialog/document-metadata.h
index fd4f76c88..1696bdb15 100644
--- a/src/ui/dialog/document-metadata.h
+++ b/src/ui/dialog/document-metadata.h
@@ -18,7 +18,7 @@
 #endif
 
 #include <list>
-#include <stddef.h>
+#include <cstddef>
 #include "ui/widget/panel.h"
 #include <gtkmm/notebook.h>
 #include <gtkmm/grid.h>
diff --git a/src/ui/dialog/document-properties.h b/src/ui/dialog/document-properties.h
index 89c87f5de..3607af441 100644
--- a/src/ui/dialog/document-properties.h
+++ b/src/ui/dialog/document-properties.h
@@ -14,7 +14,7 @@
 #ifndef INKSCAPE_UI_DIALOG_DOCUMENT_PREFERENCES_H
 #define INKSCAPE_UI_DIALOG_DOCUMENT_PREFERENCES_H
 
-#include <stddef.h>
+#include <cstddef>
 #include <sigc++/sigc++.h>
 #include <gtkmm/comboboxtext.h>
 #include <gtkmm/liststore.h>
diff --git a/src/ui/dialog/filedialogimpl-gtkmm.h b/src/ui/dialog/filedialogimpl-gtkmm.h
index 771b08df7..6c5cb38e5 100644
--- a/src/ui/dialog/filedialogimpl-gtkmm.h
+++ b/src/ui/dialog/filedialogimpl-gtkmm.h
@@ -26,7 +26,7 @@
 //General includes
 #include <unistd.h>
 #include <sys/stat.h>
-#include <errno.h>
+#include <cerrno>
 
 #include "filedialog.h"
 
diff --git a/src/ui/dialog/inkscape-preferences.h b/src/ui/dialog/inkscape-preferences.h
index 7aaef90b4..3a1105b11 100644
--- a/src/ui/dialog/inkscape-preferences.h
+++ b/src/ui/dialog/inkscape-preferences.h
@@ -23,7 +23,7 @@
 #include <vector>
 #include "ui/widget/preferences-widget.h"
 #include "ui/widget/button.h"
-#include <stddef.h>
+#include <cstddef>
 #include <gtkmm/colorbutton.h>
 #include <gtkmm/comboboxtext.h>
 #include <gtkmm/treestore.h>