diff --git a/UPGRADING.md b/UPGRADING.md
index bf3fee1b8a..474ecaf275 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -185,7 +185,7 @@ $returnType = ParametersAcceptorSelector::selectSingle($function->getVariants())
 
 **After**:
 
-```
+```php
 $returnType = $node->getFunctionReflection()->getReturnType();
 ```