diff --git a/ChangeLog-7.5.md b/ChangeLog-7.5.md
index 25346660550..58902d9b046 100644
--- a/ChangeLog-7.5.md
+++ b/ChangeLog-7.5.md
@@ -6,6 +6,7 @@ All notable changes of the PHPUnit 7.5 release series are documented in this fil
 
 ### Fixed
 
+* Fixed [#3480](https://github.com/sebastianbergmann/phpunit/issues/3480): Wrong return type declaration for `TestCase::getExpectedExceptionMessage()` and `TestCase::getExpectedExceptionMessageRegExp()`
 * Fixed [#3550](https://github.com/sebastianbergmann/phpunit/issues/3550): Check for valid attribute names in `assertObjectHasAttribute()` is too strict
 
 ## [7.5.6] - 2019-02-18
diff --git a/src/Framework/TestCase.php b/src/Framework/TestCase.php
index ce229c0c40e..9b55f2a9b33 100644
--- a/src/Framework/TestCase.php
+++ b/src/Framework/TestCase.php
@@ -118,12 +118,12 @@ abstract class TestCase extends Assert implements Test, SelfDescribing
     private $expectedException;
 
     /**
-     * @var string
+     * @var null|string
      */
     private $expectedExceptionMessage;
 
     /**
-     * @var string
+     * @var null|string
      */
     private $expectedExceptionMessageRegExp;
 
@@ -569,12 +569,12 @@ public function getExpectedExceptionCode()
         return $this->expectedExceptionCode;
     }
 
-    public function getExpectedExceptionMessage(): string
+    public function getExpectedExceptionMessage(): ?string
     {
         return $this->expectedExceptionMessage;
     }
 
-    public function getExpectedExceptionMessageRegExp(): string
+    public function getExpectedExceptionMessageRegExp(): ?string
     {
         return $this->expectedExceptionMessageRegExp;
     }