diff --git a/package.json b/package.json
index a519a2f..377ebc0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@fwdekker/template",
-    "version": "3.3.9",
+    "version": "3.3.10",
     "description": "The base template for pages on fwdekker.com.",
     "author": "Florine W. Dekker",
     "license": "MIT",
diff --git a/src/main/js/Template.ts b/src/main/js/Template.ts
index 542c457..a614fca 100644
--- a/src/main/js/Template.ts
+++ b/src/main/js/Template.ts
@@ -243,7 +243,8 @@ function footerLink(prefix: string, text: string | null | undefined, url: string
  * not a valid value as a parameter for that function, its value is considered `undefined`.
  */
 doAfterLoad(() => {
-    $("html")!.dataset["theme"] = "light";
+    const html = $("html")!;
+    if (html.dataset["theme"] == null) html.dataset["theme"] = "light";
 
     const navTarget = $(getMetaProperty("fwd:nav:target"));
     if (navTarget != null) {