diff --git a/AutoRest/Generators/Ruby/Ruby/RubyCodeNamer.cs b/AutoRest/Generators/Ruby/Ruby/RubyCodeNamer.cs
index 3709e888fdb8c..27c05e2fdace5 100644
--- a/AutoRest/Generators/Ruby/Ruby/RubyCodeNamer.cs
+++ b/AutoRest/Generators/Ruby/Ruby/RubyCodeNamer.cs
@@ -283,9 +283,9 @@ private IType NormalizeCompositeType(CompositeType compositeType)
             foreach (var property in compositeType.Properties)
             {
                 property.Name = GetPropertyName(property.GetClientName());
-                if (property.SerializedName != null)
+                if (property.SerializedName != null && !property.WasFlattened())
                 {
-                    property.SerializedName = property.SerializedName.Replace("\\", "\\\\");
+                    property.SerializedName = property.SerializedName.Replace(".", "\\\\.");
                 }
                 property.Type = NormalizeTypeReference(property.Type);
             }