diff --git a/docbook/asciidoctor-asciidoc.conf b/docbook/asciidoctor-asciidoc.conf
index ad3409aa53..7fe2644bfd 100644
--- a/docbook/asciidoctor-asciidoc.conf
+++ b/docbook/asciidoctor-asciidoc.conf
@@ -35,19 +35,21 @@ endif::[]
 # escaped right single quote
 \\`'=`'
 
-[quotes]
-# disable single quotes as constrained formatting marks for emphasis
-# this change can also be made in the document using the attribute entry :quotes.':
-ifdef::compat-mode[]
-'=
-+=
-++=
-`=
-``=#monospaced
-`|`=monospaced
-\##=#mark
-\#=mark
-endif::[]
+# Disabled for now.
+# Appears to be incompatible with Cygwin's version of AsciiDoc (8.6.3)
+#[quotes]
+## disable single quotes as constrained formatting marks for emphasis
+## this change can also be made in the document using the attribute entry :quotes.':
+#ifdef::compat-mode[]
+#'=
+#+=
+#++=
+#`=
+#``=#monospaced
+#`|`=monospaced
+#\##=#mark
+#\#=mark
+#endif::[]
 
 # enables markdown-style headings
 [titles]