diff --git a/Tests/TokenGenerator/UriSafeTokenGeneratorTest.php b/Tests/TokenGenerator/UriSafeTokenGeneratorTest.php
index a254dda..3ef3fce 100644
--- a/Tests/TokenGenerator/UriSafeTokenGeneratorTest.php
+++ b/Tests/TokenGenerator/UriSafeTokenGeneratorTest.php
@@ -43,9 +43,7 @@ public function testGenerateToken()
         $token = $this->generator->generateToken();
 
         $this->assertTrue(ctype_print($token), 'is printable');
-        $this->assertStringNotMatchesFormat('%S+%S', $token, 'is URI safe');
-        $this->assertStringNotMatchesFormat('%S/%S', $token, 'is URI safe');
-        $this->assertStringNotMatchesFormat('%S=%S', $token, 'is URI safe');
+        $this->assertDoesNotMatchRegularExpression('#.+([+/=]).+#', $token, 'is URI safe');
     }
 
     /**