diff --git a/src/Composer/DependencyResolver/Request.php b/src/Composer/DependencyResolver/Request.php
index c3367e3d9..32da89a13 100644
--- a/src/Composer/DependencyResolver/Request.php
+++ b/src/Composer/DependencyResolver/Request.php
@@ -61,7 +61,7 @@ class Request
             $constraint = new MatchAllConstraint();
         }
         if (isset($this->requires[$packageName])) {
-            throw new \LogicException('Overwriting requires seems like a bug ('.$packageName.' '.$this->requires[$packageName]->getPrettyConstraint().' => '.$constraint->getPrettyConstraint().', check why it is happening, might be a root alias');
+            throw new \LogicException('Overwriting requires seems like a bug ('.$packageName.' '.$this->requires[$packageName]->getPrettyString().' => '.$constraint->getPrettyString().', check why it is happening, might be a root alias');
         }
         $this->requires[$packageName] = $constraint;
     }