diff --git a/bin/prepare-release.php b/bin/prepare-release.php
index 2895a23f..4d00a9a6 100644
--- a/bin/prepare-release.php
+++ b/bin/prepare-release.php
@@ -304,7 +304,7 @@ private function get_stable_tag() {
 	private function update_stable_tag( $version ) {
 		$readme = file_get_contents( 'readme.txt' );
 		$readme = preg_replace(
-			'/^Stable tag:.*$/m',
+			'/^Stable tag:\s*.*$/m',
 			'Stable tag: ' . $version,
 			$readme
 		);