1 files changed, 6 insertions, 1 deletions
diff --git a/lib/hashie/mash.rb b/lib/hashie/mash.rb
index 97f75d5..194a6f8 100644
--- a/lib/hashie/mash.rb
+++ b/lib/hashie/mash.rb
@@ -406,7 +406,12 @@ module Hashie
     end
 
     def log_collision?(method_key)
-      respond_to?(method_key) && !self.class.disable_warnings?(method_key) &&
+      return unless respond_to?(method_key)
+
+      _, suffix = method_name_and_suffix(method_key)
+
+      (!suffix || suffix == '='.freeze) &&
+        !self.class.disable_warnings?(method_key) &&
         !(regular_key?(method_key) || regular_key?(method_key.to_s))
     end
   end