diff --git a/src/BlockTypes/MiniCart.php b/src/BlockTypes/MiniCart.php
index 80e9330ce40..53a0f91d891 100644
--- a/src/BlockTypes/MiniCart.php
+++ b/src/BlockTypes/MiniCart.php
@@ -276,8 +276,11 @@ protected function append_script_and_deps_src( $script ) {
 		if ( ! $script->src ) {
 			return;
 		}
+
+		$site_url = site_url() ?? wp_guess_url();
+
 		$this->scripts_to_lazy_load[ $script->handle ] = array(
-			'src'          => $script->src,
+			'src'          => preg_match( '|^(https?:)?//|', $script->src ) ? $script->src : $site_url . $script->src,
 			'version'      => $script->ver,
 			'before'       => $wp_scripts->print_inline_script( $script->handle, 'before', false ),
 			'after'        => $wp_scripts->print_inline_script( $script->handle, 'after', false ),