diff --git a/src/Symfony/Component/PropertyAccess/StringUtil.php b/src/Symfony/Component/PropertyAccess/StringUtil.php
index 354d164a05..9dc74dd2e5 100644
--- a/src/Symfony/Component/PropertyAccess/StringUtil.php
+++ b/src/Symfony/Component/PropertyAccess/StringUtil.php
@@ -188,7 +188,7 @@ class StringUtil
         }
 
         // Convert teeth to tooth, feet to foot
-        if (false !== ($pos = strpos($plural, 'ee'))) {
+        if (false !== ($pos = strpos($plural, 'ee')) && strlen($plural) > 3) {
             return substr_replace($plural, 'oo', $pos, 2);
         }