diff --git a/Sources/Subs-Compat.php b/Sources/Subs-Compat.php
index f70c3d0182..3bc002da5c 100644
--- a/Sources/Subs-Compat.php
+++ b/Sources/Subs-Compat.php
@@ -5158,7 +5158,7 @@ function loadJavaScriptFile(string $fileName, array $params = [], string $id = '
 		SMF\Theme::loadJavaScriptFile($fileName, $params, $id);
 	}
 
-	function addJavaScriptVar(string $key, string $value, bool $escape = false)
+	function addJavaScriptVar(string $key, mixed $value, bool $escape = false)
 	{
 		return SMF\Theme::addJavaScriptVar($key, $value, $escape);
 	}
diff --git a/Sources/Theme.php b/Sources/Theme.php
index 2dca28506c..dc5be92a33 100644
--- a/Sources/Theme.php
+++ b/Sources/Theme.php
@@ -661,10 +661,10 @@ public static function loadJavaScriptFile(string $fileName, array $params = [],
 	 * This is cleaner and easier for modders than Theme::addInlineJavaScript().
 	 *
 	 * @param string $key The key for this variable
-	 * @param string $value The value
+	 * @param mixed $value The value
 	 * @param bool $escape Whether or not to escape the value
 	 */
-	public static function addJavaScriptVar(string $key, string $value, bool $escape = false): void
+	public static function addJavaScriptVar(string $key, mixed $value, bool $escape = false): void
 	{
 		// Variable name must be a valid string.
 		if (!is_string($key) || $key === '' || is_numeric($key)) {