1 files changed, 3 insertions, 1 deletions

diff --git a/src/syntax.c b/src/syntax.c
index 0d8b08c01b6..d45936b2b28 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -1333,7 +1333,9 @@ DEFUN ("internal-describe-syntax-value", Finternal_describe_syntax_value,
     insert_string (" (nestable)");
 
   if (prefix)
-    insert_string (",\n\t  is a prefix character for `backward-prefix-chars'");
+    insert1 (Fsubstitute_command_keys
+             (build_string
+              (",\n\t  is a prefix character for `backward-prefix-chars'")));
 
   return syntax;
 }