diff --git a/system/Test/CIUnitTestCase.php b/system/Test/CIUnitTestCase.php
index f004d43beba4..266a22b0161d 100644
--- a/system/Test/CIUnitTestCase.php
+++ b/system/Test/CIUnitTestCase.php
@@ -445,7 +445,7 @@ public function assertHeaderNotEmitted(string $header, bool $ignoreCase = false)
      */
     public function assertCloseEnough(int $expected, $actual, string $message = '', int $tolerance = 1)
     {
-        $difference = abs($expected - (int) floor((float) $actual));
+        $difference = abs($expected - (int) floor($actual));
 
         $this->assertLessThanOrEqual($tolerance, $difference, $message);
     }