diff --git a/Slim/Routing/Dispatcher.php b/Slim/Routing/Dispatcher.php
index 0318accb3..55e7f56a1 100644
--- a/Slim/Routing/Dispatcher.php
+++ b/Slim/Routing/Dispatcher.php
@@ -38,8 +38,10 @@ protected function createDispatcher(): FastRouteDispatcher
         }
 
         $routeDefinitionCallback = function (RouteCollector $r) {
+            $basePath = $this->routeCollector->getBasePath();
+
             foreach ($this->routeCollector->getRoutes() as $route) {
-                $r->addRoute($route->getMethods(), $route->getPattern(), $route->getIdentifier());
+                $r->addRoute($route->getMethods(), $basePath . $route->getPattern(), $route->getIdentifier());
             }
         };
 
diff --git a/Slim/Routing/RouteCollectorProxy.php b/Slim/Routing/RouteCollectorProxy.php
index 695c46c7a..d4ddb1d1d 100644
--- a/Slim/Routing/RouteCollectorProxy.php
+++ b/Slim/Routing/RouteCollectorProxy.php
@@ -43,27 +43,27 @@ class RouteCollectorProxy implements RouteCollectorProxyInterface
     /**
      * @var string
      */
-    protected $basePath;
+    protected $groupPattern;
 
     /**
      * @param ResponseFactoryInterface     $responseFactory
      * @param CallableResolverInterface    $callableResolver
      * @param RouteCollectorInterface|null $routeCollector
      * @param ContainerInterface|null      $container
-     * @param string                       $basePath
+     * @param string                       $groupPattern
      */
     public function __construct(
         ResponseFactoryInterface $responseFactory,
         CallableResolverInterface $callableResolver,
         ?ContainerInterface $container = null,
         ?RouteCollectorInterface $routeCollector = null,
-        string $basePath = ''
+        string $groupPattern = ''
     ) {
         $this->responseFactory = $responseFactory;
         $this->callableResolver = $callableResolver;
         $this->container = $container;
         $this->routeCollector = $routeCollector ?? new RouteCollector($responseFactory, $callableResolver, $container);
-        $this->basePath = $basePath;
+        $this->groupPattern = $groupPattern;
     }
 
     /**
@@ -103,7 +103,7 @@ public function getRouteCollector(): RouteCollectorInterface
      */
     public function getBasePath(): string
     {
-        return $this->basePath;
+        return $this->routeCollector->getBasePath();
     }
 
     /**
@@ -111,7 +111,8 @@ public function getBasePath(): string
      */
     public function setBasePath(string $basePath): RouteCollectorProxyInterface
     {
-        $this->basePath = $basePath;
+        $this->routeCollector->setBasePath($basePath);
+
         return $this;
     }
 
@@ -176,7 +177,7 @@ public function any(string $pattern, $callable): RouteInterface
      */
     public function map(array $methods, string $pattern, $callable): RouteInterface
     {
-        $pattern = $this->basePath . $pattern;
+        $pattern = $this->groupPattern . $pattern;
 
         return $this->routeCollector->map($methods, $pattern, $callable);
     }
@@ -186,7 +187,8 @@ public function map(array $methods, string $pattern, $callable): RouteInterface
      */
     public function group(string $pattern, $callable): RouteGroupInterface
     {
-        $pattern = $this->basePath . $pattern;
+        $pattern = $this->groupPattern . $pattern;
+
         return $this->routeCollector->group($pattern, $callable);
     }
 
diff --git a/tests/Routing/RouteCollectorProxyTest.php b/tests/Routing/RouteCollectorProxyTest.php
index 70f6c8430..6564bdfde 100644
--- a/tests/Routing/RouteCollectorProxyTest.php
+++ b/tests/Routing/RouteCollectorProxyTest.php
@@ -100,16 +100,15 @@ public function testGetSetBasePath()
         $responseFactoryProphecy = $this->prophesize(ResponseFactoryInterface::class);
         $callableResolverProphecy = $this->prophesize(CallableResolverInterface::class);
         $containerProphecy = $this->prophesize(ContainerInterface::class);
-        $routeCollectorProphecy = $this->prophesize(RouteCollectorInterface::class);
 
         $routeCollectorProxy = new RouteCollectorProxy(
             $responseFactoryProphecy->reveal(),
             $callableResolverProphecy->reveal(),
-            $containerProphecy->reveal(),
-            $routeCollectorProphecy->reveal(),
-            $basePath
+            $containerProphecy->reveal()
         );
 
+        $routeCollectorProxy->setBasePath($basePath);
+
         $this->assertEquals($basePath, $routeCollectorProxy->getBasePath());
 
         $newBasePath = '/new/base/path';