diff --git a/src/Polyfills/ExpectExceptionMessageMatches.php b/src/Polyfills/ExpectExceptionMessageMatches.php
index 340605f..e9267f3 100644
--- a/src/Polyfills/ExpectExceptionMessageMatches.php
+++ b/src/Polyfills/ExpectExceptionMessageMatches.php
@@ -23,7 +23,7 @@ trait ExpectExceptionMessageMatches {
 	 *
 	 * @return void
 	 */
-	final public function expectExceptionMessageMatches( $regularExpression ) {
+	final protected function expectExceptionMessageMatches( $regularExpression ) {
 		$this->expectExceptionMessageRegExp( $regularExpression );
 	}
 }