diff --git a/src/ld-lua.c b/src/ld-lua.c
index 54ba0c4..4ed68eb 100644
--- a/src/ld-lua.c
+++ b/src/ld-lua.c
@@ -501,28 +501,35 @@ get_translation (lua_State *L, int index)
 static gboolean
 read_symbol_area (lua_State *L, int index, LdSymbolArea *area)
 {
+	lua_Number x1, x2, y1, y2;
+
 	if (lua_objlen (L, index) != 4)
 		return FALSE;
 
 	lua_rawgeti (L, index, 1);
 	if (!lua_isnumber (L, -1))
 		return FALSE;
-	area->x1 = lua_tonumber (L, -1);
+	x1 = lua_tonumber (L, -1);
 
 	lua_rawgeti (L, index, 2);
 	if (!lua_isnumber (L, -1))
 		return FALSE;
-	area->y1 = lua_tonumber (L, -1);
+	y1 = lua_tonumber (L, -1);
 
 	lua_rawgeti (L, index, 3);
 	if (!lua_isnumber (L, -1))
 		return FALSE;
-	area->x2 = lua_tonumber (L, -1);
+	x2 = lua_tonumber (L, -1);
 
 	lua_rawgeti (L, index, 4);
 	if (!lua_isnumber (L, -1))
 		return FALSE;
-	area->y2 = lua_tonumber (L, -1);
+	y2 = lua_tonumber (L, -1);
+
+	area->x = MIN (x1, x2);
+	area->y = MIN (y1, y2);
+	area->width = ABS (x2 - x1);
+	area->height = ABS (y2 - y1);
 
 	return TRUE;
 }
diff --git a/src/ld-symbol.h b/src/ld-symbol.h
index 9eff89b..0290720 100644
--- a/src/ld-symbol.h
+++ b/src/ld-symbol.h
@@ -20,18 +20,18 @@ typedef struct _LdSymbolArea LdSymbolArea;
 
 /**
  * LdSymbolArea:
- * @x1: Left-top X coordinate.
- * @y1: Left-top Y coordinate.
- * @x2: Right-bottom X coordinate.
- * @y2: Right-bottom Y coordinate.
+ * @x: Left-top X coordinate.
+ * @y: Left-top Y coordinate.
+ * @width: Width of the area, must be positive.
+ * @height: Height of the area, must be positive.
  *
  * Defines the area of the symbol relative to the center of the symbol,
  * which is at the (0, 0) coordinates.
  */
 struct _LdSymbolArea
 {
-	gdouble x1, y1;
-	gdouble x2, y2;
+	gdouble x, y;
+	gdouble width, height;
 };
 
 
diff --git a/src/ld-window-main.c b/src/ld-window-main.c
index 0597d33..bcacf3f 100644
--- a/src/ld-window-main.c
+++ b/src/ld-window-main.c
@@ -509,9 +509,9 @@ on_category_toggle (GtkToggleButton *toggle_button, gpointer user_data)
 			 * in the center of it's symbol menu item.
 			 */
 			item->scale = data->menu_height * 0.5
-				/ MAX (ABS (area.y1), ABS (area.y2)) / 2;
+				/ MAX (ABS (area.y), ABS (area.y + area.height)) / 2;
 			/* FIXME: The width is probably wrong (related to the center). */
-			item->width = item->scale * ABS (area.x2 - area.x1)
+			item->width = item->scale * area.width
 				+ data->menu_height * 0.5;
 
 			menu_width += item++->width;