diff --git a/example/standard_icons.py b/example/standard_icons.py
index 2c3c898..7d60fb9 100644
--- a/example/standard_icons.py
+++ b/example/standard_icons.py
@@ -282,7 +282,7 @@ ICON_MAP = {
     SP_TitleBarMinButton: 'minimize.svg',
     SP_TitleBarMenuButton: 'menu.svg',
     SP_TitleBarMaxButton: 'maximize.svg',
-    SP_TitleBarCloseButton: 'dialog_close.svg',
+    SP_TitleBarCloseButton: 'window_close.svg',
     SP_TitleBarNormalButton: 'restore.svg',
     SP_TitleBarShadeButton: 'shade.svg',
     SP_TitleBarUnshadeButton: 'unshade.svg',
diff --git a/extension/README.md b/extension/README.md
index ea26b12..48ea76e 100644
--- a/extension/README.md
+++ b/extension/README.md
@@ -88,7 +88,7 @@ The following is a 1:1 mapping of the standard icon enumerated name and the icon
     "SP_TitleBarMinButton": "minimize.svg",
     "SP_TitleBarMenuButton": "menu.svg",
     "SP_TitleBarMaxButton": "maximize.svg",
-    "SP_TitleBarCloseButton": "dialog_close.svg",
+    "SP_TitleBarCloseButton": "window_close.svg",
     "SP_TitleBarNormalButton": "restore.svg",
     "SP_TitleBarShadeButton": "shade.svg",
     "SP_TitleBarUnshadeButton": "unshade.svg",
diff --git a/extension/standard-icons/icons.json b/extension/standard-icons/icons.json
index 2d021ce..3b2d90f 100644
--- a/extension/standard-icons/icons.json
+++ b/extension/standard-icons/icons.json
@@ -147,5 +147,8 @@
     },
     "volume_muted": {
         "default": ["foreground"]
+    },
+    "window_close": {
+        "default": ["foreground"]
     }
 }
diff --git a/extension/standard-icons/window_close.svg.in b/extension/standard-icons/window_close.svg.in
new file mode 100644
index 0000000..0930894
--- /dev/null
+++ b/extension/standard-icons/window_close.svg.in
@@ -0,0 +1,3 @@
+<svg width="24" height="24">
+  <path fill="^0^" d="M19,6.41L17.59,5L12,10.59L6.41,5L5,6.41L10.59,12L5,17.59L6.41,19L12,13.41L17.59,19L19,17.59L13.41,12L19,6.41Z"/>
+</svg>