diff --git a/website/versioned_docs/version-0.13/01-language-basics/27-opaque.md b/website/versioned_docs/version-0.13/01-language-basics/27-opaque.md
index a3b0dd0..d0f079a 100644
--- a/website/versioned_docs/version-0.13/01-language-basics/27-opaque.md
+++ b/website/versioned_docs/version-0.13/01-language-basics/27-opaque.md
@@ -14,10 +14,10 @@ const Button = opaque {};
 extern fn show_window(*Window) callconv(.C) void;
 
 test "opaque" {
-    var main_window: *Window = undefined;
+    const main_window: *Window = undefined;
     show_window(main_window);
 
-    var ok_button: *Button = undefined;
+    const ok_button: *Button = undefined;
     show_window(ok_button);
 }
 ```
diff --git a/website/versioned_docs/version-0.14/01-language-basics/27-opaque.md b/website/versioned_docs/version-0.14/01-language-basics/27-opaque.md
index a3b0dd0..d0f079a 100644
--- a/website/versioned_docs/version-0.14/01-language-basics/27-opaque.md
+++ b/website/versioned_docs/version-0.14/01-language-basics/27-opaque.md
@@ -14,10 +14,10 @@ const Button = opaque {};
 extern fn show_window(*Window) callconv(.C) void;
 
 test "opaque" {
-    var main_window: *Window = undefined;
+    const main_window: *Window = undefined;
     show_window(main_window);
 
-    var ok_button: *Button = undefined;
+    const ok_button: *Button = undefined;
     show_window(ok_button);
 }
 ```