diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 26de6a18..724aed35 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -103,3 +103,12 @@ jobs:
           author_email: "phpcsfixer@example.com"
           message: Fix code style (php-cs-fixer)
 
+  phpstan:
+    name: Static analysis (PHPStan)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install composer dependencies
+        run: composer install
+      - name: Run phpstan
+        run: vendor/bin/phpstan analyse
diff --git a/composer.json b/composer.json
index 587bbb06..68f16f25 100644
--- a/composer.json
+++ b/composer.json
@@ -63,7 +63,8 @@
         "docker-rebuild": "PHP_VERSION=8.1 docker-compose up -d --no-deps --build",
         "docker-m1": "ln -s docker-compose-m1.override.yml docker-compose.override.yml",
         "coverage": "open coverage/phpunit/html/index.html",
-        "phpstan": "vendor/bin/phpstan --pro",
+        "phpstan": "vendor/bin/phpstan",
+        "phpstan-pro": "vendor/bin/phpstan --pro",
         "cs": "php-cs-fixer fix --config=.php-cs-fixer.php",
         "test": "PHP_VERSION=8.1 ./test --no-coverage",
         "test-full": "PHP_VERSION=8.1 ./test"
diff --git a/src/Resolvers/PathTenantResolver.php b/src/Resolvers/PathTenantResolver.php
index 1359e9c1..090ea365 100644
--- a/src/Resolvers/PathTenantResolver.php
+++ b/src/Resolvers/PathTenantResolver.php
@@ -15,7 +15,10 @@ class PathTenantResolver extends Contracts\CachedTenantResolver
         /** @var Route $route */
         $route = $args[0];
 
-        if ($id = (string) $route->parameter(static::tenantParameterName())) {
+        /** @var string $id */
+        $id = $route->parameter(static::tenantParameterName());
+
+        if ($id) {
             $route->forgetParameter(static::tenantParameterName());
 
             if ($tenant = tenancy()->find($id)) {