diff --git a/packages/ostruct-sanitizer/Gemfile.lock b/packages/ostruct-sanitizer/Gemfile.lock
index 60ef19c5..916827d4 100644
--- a/packages/ostruct-sanitizer/Gemfile.lock
+++ b/packages/ostruct-sanitizer/Gemfile.lock
@@ -111,6 +111,7 @@ GEM
       rexml
 
 PLATFORMS
+  arm64-darwin-22
   x86_64-linux
 
 DEPENDENCIES
diff --git a/packages/ostruct-sanitizer/lib/ostruct/sanitizer.rb b/packages/ostruct-sanitizer/lib/ostruct/sanitizer.rb
index 8957aba5..7d5226f3 100644
--- a/packages/ostruct-sanitizer/lib/ostruct/sanitizer.rb
+++ b/packages/ostruct-sanitizer/lib/ostruct/sanitizer.rb
@@ -62,7 +62,7 @@ def method_missing(method, *args)
     # @param [Any] value the attribute's value
     #
     def []=(name, value)
-      send("#{name}=", value)
+      send(:"#{name}=", value)
     end
 
   private
@@ -72,7 +72,7 @@ def setter?(method)
     end
 
     def override_setter_for(field)
-      define_singleton_method("#{field}=") do |value|
+      define_singleton_method(:"#{field}=") do |value|
         @table[field] = sanitize(field, value)
       end
     end