diff --git a/Source/GSThemeDrawing.m b/Source/GSThemeDrawing.m
index 14c5919e3..9d03eb258 100644
--- a/Source/GSThemeDrawing.m
+++ b/Source/GSThemeDrawing.m
@@ -3238,7 +3238,12 @@ typedef enum {
 
   if (boxType == NSBoxSeparator)
     {
-      [[box borderColor] set];
+      color = [box borderColor];
+      if (!color || [color isEqual:[NSColor clearColor]])
+        {
+    	  color = [NSColor controlShadowColor];
+        }
+      [color set];
       NSRectFill([box borderRect]);
       return;
     }