diff --git a/fixtures/Path.php b/fixtures/Path.php
index de15e0d..8f9afa1 100644
--- a/fixtures/Path.php
+++ b/fixtures/Path.php
@@ -31,8 +31,9 @@ public static function directories(): Set
      */
     private static function strings(): Set
     {
-        return Set::strings()->filter(
-            static fn($value) => (bool) \preg_match('~\S+~', $value),
-        );
+        return Set::strings()
+            ->filter(static fn($value) => (bool) \preg_match('~\S+~', $value))
+            ->exclude(static fn($value) => \str_contains($value, '//'))
+            ->exclude(static fn($value) => \str_starts_with($value, '\\'));
     }
 }
diff --git a/tests/PathTest.php b/tests/PathTest.php
index 01551a2..7dfd97e 100644
--- a/tests/PathTest.php
+++ b/tests/PathTest.php
@@ -110,6 +110,13 @@ public function testResolveAbsolutility(): BlackBox\Proof
             });
     }
 
+    public function testPathStartingWithBackslashIsInvalid()
+    {
+        $this->assert()->throws(
+            static fn() => Path::of('\\\\'),
+        );
+    }
+
     public static function resolutions(): array
     {
         return [