diff --git a/rules-tests/CodeQuality/Rector/Equal/UseIdenticalOverEqualWithSameTypeRector/Fixture/skip_union.php.inc b/rules-tests/CodeQuality/Rector/Equal/UseIdenticalOverEqualWithSameTypeRector/Fixture/skip_union.php.inc
new file mode 100644
index 00000000000..83c5dde689a
--- /dev/null
+++ b/rules-tests/CodeQuality/Rector/Equal/UseIdenticalOverEqualWithSameTypeRector/Fixture/skip_union.php.inc
@@ -0,0 +1,9 @@
+<?php
+
+final class SkipUnion
+{
+    public function run(int|string|float $firstValue, int|string|float $secondValue)
+    {
+        return $firstValue == $secondValue;
+    }
+}
diff --git a/rules/CodeQuality/Rector/Equal/UseIdenticalOverEqualWithSameTypeRector.php b/rules/CodeQuality/Rector/Equal/UseIdenticalOverEqualWithSameTypeRector.php
index 3c8e87d016f..37f11bc21df 100644
--- a/rules/CodeQuality/Rector/Equal/UseIdenticalOverEqualWithSameTypeRector.php
+++ b/rules/CodeQuality/Rector/Equal/UseIdenticalOverEqualWithSameTypeRector.php
@@ -18,6 +18,7 @@
 use PHPStan\Type\StringType;
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeTraverser;
+use PHPStan\Type\UnionType;
 use Rector\NodeTypeResolver\Node\AttributeKey;
 use Rector\Rector\AbstractRector;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
@@ -96,6 +97,10 @@ public function refactor(Node $node): ?Node
             return null;
         }
 
+        if ($normalizedLeftType instanceof UnionType) {
+            return null;
+        }
+
         return $this->processIdenticalOrNotIdentical($node);
     }