diff --git a/src/Composer/DependencyResolver/Operation/MarkAliasInstalledOperation.php b/src/Composer/DependencyResolver/Operation/MarkAliasInstalledOperation.php
index 4638709ed..072ac702a 100644
--- a/src/Composer/DependencyResolver/Operation/MarkAliasInstalledOperation.php
+++ b/src/Composer/DependencyResolver/Operation/MarkAliasInstalledOperation.php
@@ -61,6 +61,6 @@ class MarkAliasInstalledOperation extends SolverOperation
      */
     public function __toString()
     {
-        return 'Marking '.$this->package->getPrettyName().' ('.$this->package->getPrettyVersion().') as installed, alias of '.$this->package->getAliasOf()->getPrettyName().' ('.$this->package->getAliasOf()->getPrettyVersion().')';
+        return 'Marking '.$this->package->getPrettyName().' ('.$this->formatVersion($this->package).') as installed, alias of '.$this->package->getAliasOf()->getPrettyName().' ('.$this->formatVersion($this->package->getAliasOf()).')';
     }
 }
diff --git a/src/Composer/DependencyResolver/Operation/MarkAliasUninstalledOperation.php b/src/Composer/DependencyResolver/Operation/MarkAliasUninstalledOperation.php
index 648356df5..f1cd6c040 100644
--- a/src/Composer/DependencyResolver/Operation/MarkAliasUninstalledOperation.php
+++ b/src/Composer/DependencyResolver/Operation/MarkAliasUninstalledOperation.php
@@ -61,6 +61,6 @@ class MarkAliasUninstalledOperation extends SolverOperation
      */
     public function __toString()
     {
-        return 'Marking '.$this->package->getPrettyName().' ('.$this->package->getPrettyVersion().') as uninstalled, alias of '.$this->package->getAliasOf()->getPrettyName().' ('.$this->package->getAliasOf()->getPrettyVersion().')';
+        return 'Marking '.$this->package->getPrettyName().' ('.$this->formatVersion($this->package).') as uninstalled, alias of '.$this->package->getAliasOf()->getPrettyName().' ('.$this->formatVersion($this->package->getAliasOf()).')';
     }
 }