diff --git a/src/Pecee/SimpleRouter/Route/RouteGroup.php b/src/Pecee/SimpleRouter/Route/RouteGroup.php
index bdcf2e8..6520cc8 100644
--- a/src/Pecee/SimpleRouter/Route/RouteGroup.php
+++ b/src/Pecee/SimpleRouter/Route/RouteGroup.php
@@ -7,6 +7,7 @@ use Pecee\SimpleRouter\Handlers\IExceptionHandler;
 
 class RouteGroup extends Route implements IGroupRoute
 {
+    protected $urlRegex = '/^%s\/?/u';
     protected $prefix;
     protected $name;
     protected $domains = [];
@@ -55,16 +56,19 @@ class RouteGroup extends Route implements IGroupRoute
             return false;
         }
 
-        // Parse parameter
+        // Parse group prefix parameters
+        if(count($this->originalParameters) === 0) {
+            $this->parseParameters($this->prefix, $url);
+        }
 
-        $prefix = $this->prefix;
+        $parsedPrefix = $this->prefix;
 
         foreach ($this->getParameters() as $parameter => $value) {
-            $prefix = str_ireplace('{' . $parameter . '}', $value, $prefix);
+            $parsedPrefix = str_ireplace('{' . $parameter . '}', $value, $parsedPrefix);
         }
 
         /* Skip if prefix doesn't match */
-        if ($this->prefix !== null && stripos($url, $prefix) === false) {
+        if ($this->prefix !== null && stripos($url, $parsedPrefix) === false) {
             return false;
         }
 
diff --git a/src/Pecee/SimpleRouter/Route/RoutePartialGroup.php b/src/Pecee/SimpleRouter/Route/RoutePartialGroup.php
index 1e1a51b..9960d29 100644
--- a/src/Pecee/SimpleRouter/Route/RoutePartialGroup.php
+++ b/src/Pecee/SimpleRouter/Route/RoutePartialGroup.php
@@ -6,14 +6,7 @@ use Pecee\Http\Request;
 
 class RoutePartialGroup extends RouteGroup implements IPartialGroupRoute
 {
-
-    /**
-     * RoutePartialGroup constructor.
-     */
-    public function __construct()
-    {
-        $this->urlRegex = '/^%s\/?/u';
-    }
+    protected $urlRegex = '/^%s\/?/u';
 
     /**
      * Method called to check if route matches
diff --git a/tests/Pecee/SimpleRouter/RouterUrlTest.php b/tests/Pecee/SimpleRouter/RouterUrlTest.php
index f9b0d4b..5da97de 100644
--- a/tests/Pecee/SimpleRouter/RouterUrlTest.php
+++ b/tests/Pecee/SimpleRouter/RouterUrlTest.php
@@ -271,4 +271,41 @@ class RouterUrlTest extends \PHPUnit\Framework\TestCase
         TestRouter::router()->reset();
     }
 
+    public function testGroupPrefix() {
+
+        $result = false;
+
+        TestRouter::group(['prefix' => '/lang/{lang}'], function () use(&$result) {
+
+            TestRouter::get('/test', function() use(&$result) {
+                $result = true;
+            });
+        });
+
+        TestRouter::debug('/lang/da/test');
+
+        $this->assertTrue($result);
+
+        // Test group prefix sub-route
+
+        $result = null;
+        $expectedResult = 28;
+
+        TestRouter::group(['prefix' => '/lang/{lang}'], function () use(&$result, $expectedResult) {
+
+            TestRouter::get('/horse/{horseType}', function($horseType) use(&$result) {
+                $result = false;
+            });
+
+            TestRouter::get('/user/{userId}', function($userId) use(&$result, $expectedResult) {
+                $result = $userId;
+            });
+        });
+
+        TestRouter::debug("/lang/da/user/$expectedResult");
+
+        $this->assertEquals($expectedResult, $result);
+
+    }
+
 }
\ No newline at end of file