diff --git a/src/Test/PHPUnit/AbstractCacheConstraint.php b/src/Test/PHPUnit/AbstractCacheConstraint.php
index 2b4ab888..dc2be3c8 100644
--- a/src/Test/PHPUnit/AbstractCacheConstraint.php
+++ b/src/Test/PHPUnit/AbstractCacheConstraint.php
@@ -64,7 +64,7 @@ protected function matches($other)
             throw new \RuntimeException($message);
         }
 
-        return $this->getValue() === (string) $other->getHeaderLine($this->header);
+        return strpos((string) $other->getHeaderLine($this->header), $this->getValue()) !== false;
     }
 
     /**