diff --git a/examples/abnf2pegtl.cc b/examples/abnf2pegtl.cc
index 7709fc68d..bb9ac7af2 100644
--- a/examples/abnf2pegtl.cc
+++ b/examples/abnf2pegtl.cc
@@ -263,7 +263,7 @@ namespace abnf2pegtl
             s += ", ";
          }
          s += '\'';
-         if( c == '\'' ) {
+         if( c == '\'' || c == '\\' ) {
             s += '\\';
          }
          s += c;