diff --git a/src/wp-includes/script-loader.php b/src/wp-includes/script-loader.php
index 4bac8ccf42..866ca54e2d 100644
--- a/src/wp-includes/script-loader.php
+++ b/src/wp-includes/script-loader.php
@@ -416,7 +416,7 @@ function wp_default_packages_inline_scripts( $scripts ) {
 						'datetimeAbbreviated' => __( 'M j, Y g:i a' ),
 					),
 					'timezone' => array(
-						'offset' => get_option( 'gmt_offset', 0 ),
+						'offset' => (float) get_option( 'gmt_offset', 0 ),
 						'string' => $timezone_string,
 						'abbr'   => $timezone_abbr,
 					),