diff --git a/shared/lib/InterDocumentReferencesMacro/extension.rb b/shared/lib/InterDocumentReferencesMacro/extension.rb
index 76e63f4a89..455f63c002 100644
--- a/shared/lib/InterDocumentReferencesMacro/extension.rb
+++ b/shared/lib/InterDocumentReferencesMacro/extension.rb
@@ -1,34 +1,34 @@
 require 'asciidoctor/extensions' unless RUBY_ENGINE == 'opal'
 
 include ::Asciidoctor
 
 class InterDocumentReferencesMacro < Asciidoctor::Extensions::InlineMacroProcessor
   use_dsl
 
   named :crossref
   name_positional_attributes 'attributes'
 
   def process parent, target, attrs
     destination = target
     anchor = attrs[1]
     text = attrs[2]
 
     doc = parent.document
 
-    if doc.attributes['book'] == 'True'
-      if doc.attributes['isonline'] == 1
+    if doc.attributes['book'] == "true"
+      if doc.attributes['isonline'] == "1"
         (create_anchor parent, text, type: :link, target: %(./##{anchor})).render
       else
         (create_anchor parent, text, type: :link, target: %(./index.html##{anchor})).render
       end
     else
-      if doc.attributes['isonline'] == 1
+      if doc.attributes['isonline'] == "1"
         (create_anchor parent, text, type: :link, target: %(../#{destination}/##{anchor})).render
       else
         (create_anchor parent, text, type: :link, target: %(../#{destination}/index.html##{anchor})).render
       end
     end
 
   end
 end