diff --git a/lib/filemaker/metadata/field.rb b/lib/filemaker/metadata/field.rb
index d3054ab..aef6315 100644
--- a/lib/filemaker/metadata/field.rb
+++ b/lib/filemaker/metadata/field.rb
@@ -79,7 +79,7 @@ def raw_cast(value)
           value
         end
       rescue StandardError => e
-        warn "Could not coerce #{name}: #{value} due to #{e.message}"
+        warn "Could not coerce #{name}: #{value} due to #{e.message.force_encoding('UTF-8')}"
         value
       end