diff --git a/Uri/Http.php b/Uri/Http.php
index c410ecbe4..12395aa18 100644
--- a/Uri/Http.php
+++ b/Uri/Http.php
@@ -281,7 +281,7 @@ class Http implements UriInterface
     /**
      * {@inheritdoc}
      */
-    public function getQuery(string $key = null) /* : ?string */
+    public function getQuery(string $key = null)  : string
     {
         if(isset($key)) {
             $key = strtolower($key);
diff --git a/Uri/UriInterface.php b/Uri/UriInterface.php
index 50617e95c..1638df2a4 100644
--- a/Uri/UriInterface.php
+++ b/Uri/UriInterface.php
@@ -117,11 +117,11 @@ interface UriInterface
      *
      * @param string $key Query key
      *
-     * @return string|array
+     * @return string
      *
      * @since  1.0.0
      */
-    public function getQuery(string $key = null);
+    public function getQuery(string $key = null) : string;
 
     /**
      * Get fragment.