diff --git a/src/Factories/TestCaseFactory.php b/src/Factories/TestCaseFactory.php
index 022c0d1a..49c6eaad 100644
--- a/src/Factories/TestCaseFactory.php
+++ b/src/Factories/TestCaseFactory.php
@@ -165,7 +165,7 @@ final class TestCaseFactory
             }, $filename);
         }
 
-        $filename     = realpath($filename);
+        $filename     = (string) realpath($filename);
         $rootPath     = TestSuite::getInstance()->rootPath;
         $relativePath = str_replace($rootPath . DIRECTORY_SEPARATOR, '', $filename);
         $relativePath = dirname(ucfirst($relativePath)) . DIRECTORY_SEPARATOR . basename($relativePath, '.php');
diff --git a/src/PendingObjects/UsesCall.php b/src/PendingObjects/UsesCall.php
index 52d81b74..f9418fd5 100644
--- a/src/PendingObjects/UsesCall.php
+++ b/src/PendingObjects/UsesCall.php
@@ -83,7 +83,7 @@ final class UsesCall
                 throw new InvalidUsesPath($target);
             }
 
-            return realpath($target);
+            return (string) realpath($target);
         }, $targets);
     }
 
diff --git a/src/Support/Backtrace.php b/src/Support/Backtrace.php
index 0e87e849..cf90ab03 100644
--- a/src/Support/Backtrace.php
+++ b/src/Support/Backtrace.php
@@ -24,7 +24,7 @@ final class Backtrace
         $current = null;
 
         foreach (debug_backtrace() as $trace) {
-            if (Str::endsWith($trace[self::FILE], realpath('vendor/phpunit/phpunit/src/Util/FileLoader.php'))) {
+            if (Str::endsWith($trace[self::FILE], (string) realpath('vendor/phpunit/phpunit/src/Util/FileLoader.php'))) {
                 break;
             }