diff --git a/src/PhpPact/Consumer/Matcher/Matcher.php b/src/PhpPact/Consumer/Matcher/Matcher.php
index b2feea73..0ddcf475 100644
--- a/src/PhpPact/Consumer/Matcher/Matcher.php
+++ b/src/PhpPact/Consumer/Matcher/Matcher.php
@@ -466,9 +466,9 @@ public function matchingField(string $fieldName): MatcherInterface
         return $this->withFormatter(new MatchingField($fieldName));
     }
 
-    private function withFormatter(MatcherInterface $matcher): MatcherInterface
+    private function withFormatter(MatcherInterface&FormatterAwareInterface $matcher): MatcherInterface
     {
-        if ($matcher instanceof FormatterAwareInterface && $this->formatter) {
+        if ($this->formatter) {
             $matcher->setFormatter($this->formatter);
         }