diff --git a/src/Parser.php b/src/Parser.php
index 3553007a95e..3510601706f 100644
--- a/src/Parser.php
+++ b/src/Parser.php
@@ -54,6 +54,7 @@ class Parser
     private $importedSymbols;
     private $traits;
     private $embeddedTemplates = [];
+    private int $nextEmbedIndex = 1;
     private $varNameSalt = 0;
     private $ignoreUnknownTwigCallables = false;
     private ExpressionParsers $parsers;
@@ -81,8 +82,13 @@ public function getVarName(): string
      */
     public function parse(TokenStream $stream, $test = null, bool $dropNeedle = false): ModuleNode
     {
+        // restore on root modules only
+        if (!$this->stack) {
+            $this->nextEmbedIndex = 1;
+        }
+
         $vars = get_object_vars($this);
-        unset($vars['stack'], $vars['env'], $vars['handlers'], $vars['visitors'], $vars['expressionParser'], $vars['reservedMacroNames'], $vars['varNameSalt']);
+        unset($vars['stack'], $vars['env'], $vars['handlers'], $vars['visitors'], $vars['expressionParser'], $vars['reservedMacroNames'], $vars['nextEmbedIndex'], $vars['varNameSalt']);
         $this->stack[] = $vars;
 
         // node visitors
@@ -319,7 +325,7 @@ public function hasTraits(): bool
      */
     public function embedTemplate(ModuleNode $template)
     {
-        $template->setIndex(mt_rand());
+        $template->setIndex($this->nextEmbedIndex++);
 
         $this->embeddedTemplates[] = $template;
     }