diff --git a/src/Psalm/Internal/PhpVisitor/PartialParserVisitor.php b/src/Psalm/Internal/PhpVisitor/PartialParserVisitor.php
index 4577041f24a..e1f5e3ad328 100644
--- a/src/Psalm/Internal/PhpVisitor/PartialParserVisitor.php
+++ b/src/Psalm/Internal/PhpVisitor/PartialParserVisitor.php
@@ -196,7 +196,7 @@ public function enterNode(PhpParser\Node $node, &$traverseChildren = true)
                             // Because we insert the extra colon we have to keep track of the places
                             // we inserted it, and then shift the file offsets accordingly after
                             // parsing has been done
-                            $hacky_class_fix = preg_replace_callback(
+                            $hacky_class_fix = \preg_replace_callback(
                                 '/(->|::)(\n\s*if\s*\()/',
                                 function (array $match) use (&$extra_characters) {
                                     /**