diff --git a/src/Composer/DependencyResolver/Solver.php b/src/Composer/DependencyResolver/Solver.php
index d303bc8b4..f7586da64 100644
--- a/src/Composer/DependencyResolver/Solver.php
+++ b/src/Composer/DependencyResolver/Solver.php
@@ -934,7 +934,7 @@ class Solver
 
     protected function literalFromId($id)
     {
-        $package = $this->pool->packageById($id);
+        $package = $this->pool->packageById(abs($id));
         return new Literal($package, $id > 0);
     }