diff --git a/src/Composer/Json/JsonFile.php b/src/Composer/Json/JsonFile.php
index 2af32d32f..307139a6f 100644
--- a/src/Composer/Json/JsonFile.php
+++ b/src/Composer/Json/JsonFile.php
@@ -104,7 +104,7 @@ class JsonFile
                 );
             }
         }
-        file_put_contents($this->path, static::encode($hash, $options));
+        file_put_contents($this->path, static::encode($hash, $options). ($options & JSON_PRETTY_PRINT ? "\n" : ''));
     }
 
     /**