diff --git a/app/models/concerns/has_custom_fields.rb b/app/models/concerns/has_custom_fields.rb
index cd9349539..cfe0db590 100644
--- a/app/models/concerns/has_custom_fields.rb
+++ b/app/models/concerns/has_custom_fields.rb
@@ -12,7 +12,7 @@ module HasCustomFields
       end
     end
 
-    CUSTOM_FIELD_TRUE = ['t','true', 'T', 'True', 'TRUE'].freeze unless defined? CUSTOM_FIELD_TRUE
+    CUSTOM_FIELD_TRUE = ['1', 't', 'true', 'T', 'True', 'TRUE'].freeze unless defined? CUSTOM_FIELD_TRUE
 
     def self.cast_custom_field(key, value, types)
       return value unless types && type = types[key]