diff --git a/libs/gtkmm2ext/gtkmm2ext/cell_renderer_pixbuf_multi.h b/libs/gtkmm2ext/gtkmm2ext/cell_renderer_pixbuf_multi.h
index f4451a77d7..dfa81cffe0 100644
--- a/libs/gtkmm2ext/gtkmm2ext/cell_renderer_pixbuf_multi.h
+++ b/libs/gtkmm2ext/gtkmm2ext/cell_renderer_pixbuf_multi.h
@@ -28,6 +28,7 @@
 #endif
 
 #include <map>
+#include <stdint.h>
 
 #include <gtkmm/drawingarea.h>
 #include <gtkmm/adjustment.h>