diff --git a/src/modules/skinneable_theme.cpp b/src/modules/skinneable_theme.cpp
index b8a9926fc..42d66a3f4 100644
--- a/src/modules/skinneable_theme.cpp
+++ b/src/modules/skinneable_theme.cpp
@@ -26,6 +26,7 @@
 #include "loadpng.h"
 #include "ase_exception.h"
 #include "modules/skinneable_theme.h"
+#include "modules/gui.h"
 
 #define CHARACTER_LENGTH(f, c)	((f)->vtable->char_length((f), (c)))
 
@@ -1621,6 +1622,24 @@ void SkinneableTheme::less_bevel(int *bevel)
   if (bevel[3] > 0) --bevel[3];
 }
 
+BITMAP* SkinneableTheme::apply_gui_scale(BITMAP* original)
+{
+  int scale = guiscale();
+  if (scale > 1) {
+    BITMAP* scaled = create_bitmap(original->w*scale,
+				   original->h*scale);
+
+    for (int y=0; y<scaled->h; ++y)
+      for (int x=0; x<scaled->w; ++x)
+	putpixel(scaled, x, y, getpixel(original, x/scale, y/scale));
+
+    destroy_bitmap(original);
+    return scaled;
+  }
+  else
+    return original;
+}
+
 /* controls the "X" button in a window to close it */
 bool SkinneableTheme::theme_frame_button_msg_proc(JWidget widget, JMessage msg)
 {
diff --git a/src/modules/skinneable_theme.h b/src/modules/skinneable_theme.h
index 013a7c952..fd185d537 100644
--- a/src/modules/skinneable_theme.h
+++ b/src/modules/skinneable_theme.h
@@ -386,6 +386,7 @@ private:
   void draw_entry_cursor(JWidget widget, int x, int y);
   void draw_bevel_box(int x1, int y1, int x2, int y2, int c1, int c2, int *bevel);
   void less_bevel(int *bevel);
+  BITMAP* apply_gui_scale(BITMAP* original);
 
   static bool theme_frame_button_msg_proc(JWidget widget, JMessage msg);
   static bool theme_combobox_button_msg_proc(JWidget widget, JMessage msg);