diff --git a/src/Psalm/Internal/Analyzer/Statements/Block/IfElse/ElseAnalyzer.php b/src/Psalm/Internal/Analyzer/Statements/Block/IfElse/ElseAnalyzer.php
index 9590811e9..e55f6e49a 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Block/IfElse/ElseAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Block/IfElse/ElseAnalyzer.php
@@ -86,7 +86,7 @@ class ElseAnalyzer
 
             foreach ($changed_var_ids as $changed_var_id => $_) {
                 foreach ($else_context->vars_in_scope as $var_id => $_) {
-                    if (preg_match('/' . preg_quote($changed_var_id, '/') . '[\]\[\-]/', $var_id)
+                    if (\preg_match('/' . \preg_quote($changed_var_id, '/') . '[\]\[\-]/', $var_id)
                         && !\array_key_exists($var_id, $changed_var_ids)
                     ) {
                         unset($else_context->vars_in_scope[$var_id]);