diff --git a/lib/zeitwerk/inflector.rb b/lib/zeitwerk/inflector.rb
index b04bb74..4898376 100644
--- a/lib/zeitwerk/inflector.rb
+++ b/lib/zeitwerk/inflector.rb
@@ -15,7 +15,7 @@ class Inflector
     # @param _abspath [String]
     # @return [String]
     def camelize(basename, _abspath)
-      overrides[basename] || basename.split('_').map!(&:capitalize).join
+      overrides[basename] || basename.split('_').each(&:capitalize!).join
     end
 
     # Configures hard-coded inflections: