diff --git a/src/Psalm/Internal/Type/SimpleAssertionReconciler.php b/src/Psalm/Internal/Type/SimpleAssertionReconciler.php
index 8a2ff9d1f..13a6f9fc2 100644
--- a/src/Psalm/Internal/Type/SimpleAssertionReconciler.php
+++ b/src/Psalm/Internal/Type/SimpleAssertionReconciler.php
@@ -80,6 +80,7 @@ use function count;
 use function explode;
 use function get_class;
 use function min;
+use function strlen;
 use function strpos;
 use function strtolower;
 
diff --git a/src/Psalm/Type/Reconciler.php b/src/Psalm/Type/Reconciler.php
index 62293693b..04d0d909a 100644
--- a/src/Psalm/Type/Reconciler.php
+++ b/src/Psalm/Type/Reconciler.php
@@ -69,6 +69,7 @@ use function preg_match;
 use function preg_quote;
 use function str_replace;
 use function str_split;
+use function strlen;
 use function strpos;
 use function strtolower;
 use function substr;