diff --git a/src/Psalm/Internal/PhpVisitor/Reflector/FunctionLikeDocblockParser.php b/src/Psalm/Internal/PhpVisitor/Reflector/FunctionLikeDocblockParser.php
index ad3f0a4a0d7..e44c08bfbc7 100644
--- a/src/Psalm/Internal/PhpVisitor/Reflector/FunctionLikeDocblockParser.php
+++ b/src/Psalm/Internal/PhpVisitor/Reflector/FunctionLikeDocblockParser.php
@@ -574,6 +574,7 @@ public static function parse(
 
         $info->variadic = isset($parsed_docblock->tags['psalm-variadic']);
         $info->pure = isset($parsed_docblock->tags['psalm-pure'])
+            || isset($parsed_docblock->tags['phpstan-pure'])
             || isset($parsed_docblock->tags['pure']);
 
         if (isset($parsed_docblock->tags['psalm-mutation-free'])) {