diff --git a/src/wp-includes/class.wp-scripts.php b/src/wp-includes/class.wp-scripts.php
index fbb8b2202d..e7df14e6b3 100644
--- a/src/wp-includes/class.wp-scripts.php
+++ b/src/wp-includes/class.wp-scripts.php
@@ -142,7 +142,7 @@ class WP_Scripts extends WP_Dependencies {
 
 		$tag = "<script type='text/javascript' src='$src'></script>\n";
 
-		/** 
+		/**
 		 * Filter the HTML script tag of an enqueued script.
 		 *
 		 * @since 4.1.0
@@ -171,6 +171,10 @@ class WP_Scripts extends WP_Dependencies {
 		if ( $handle === 'jquery' )
 			$handle = 'jquery-core';
 
+		if ( is_callable( $l10n ) ) {
+			$l10n = call_user_func( $l10n );
+		}
+
 		if ( is_array($l10n) && isset($l10n['l10n_print_after']) ) { // back compat, preserve the code in 'l10n_print_after' if present
 			$after = $l10n['l10n_print_after'];
 			unset($l10n['l10n_print_after']);
diff --git a/src/wp-includes/functions.wp-scripts.php b/src/wp-includes/functions.wp-scripts.php
index 0e09a2dd66..638693716c 100644
--- a/src/wp-includes/functions.wp-scripts.php
+++ b/src/wp-includes/functions.wp-scripts.php
@@ -106,10 +106,11 @@ function wp_register_script( $handle, $src, $deps = array(), $ver = false, $in_f
  *
  * @todo Documentation cleanup
  *
- * @param string $handle      Script handle the data will be attached to.
- * @param string $object_name Name for the JavaScript object. Passed directly, so it should be qualified JS variable.
- *                            Example: '/[a-zA-Z0-9_]+/'.
- * @param array $l10n         The data itself. The data can be either a single or multi-dimensional array.
+ * @param string         $handle       Script handle the data will be attached to.
+ * @param string         $object_name  Name for the JavaScript object. Passed directly, so it should be qualified JS variable.
+ *                                     Example: '/[a-zA-Z0-9_]+/'.
+ * @param array|callable $l10n         The data itself. The data can be either a single or multi-dimensional array. If a callable
+ *                                     is passed, it will be invoked at runtime.
  * @return bool True if the script was successfully localized, false otherwise.
  */
 function wp_localize_script( $handle, $object_name, $l10n ) {