diff --git a/dependency-minification.php b/dependency-minification.php
index 1938f7f..28a0990 100644
--- a/dependency-minification.php
+++ b/dependency-minification.php
@@ -728,6 +728,10 @@ static function group_handles_by_extra( array $handles, WP_Dependencies $wp_deps
 			unset($extra['suffix']);
 			unset($extra['rtl']);
 			unset($extra['data']);
+			// Default scripts are not assigned 'group', so we use the original 'deps->args' value
+			if ( is_a( $wp_deps, 'WP_Scripts' ) && empty( $extra['group'] ) && is_int( $dep->args ) ) {
+				$extra['group'] = $dep->args;
+			}
 			ksort($extra);
 			$key = serialize($extra);
 			$bundles[$key][] = $handle;