1 files changed, 2 insertions, 0 deletions
diff --git a/src/casefiddle.c b/src/casefiddle.c
index 815f684e26a..b6551618b2f 100644
--- a/src/casefiddle.c
+++ b/src/casefiddle.c
@@ -221,6 +221,8 @@ casify_region (enum case_action flag, Lisp_Object b, Lisp_Object e)
   start_byte = CHAR_TO_BYTE (start);
   end_byte = CHAR_TO_BYTE (end);
 
+  SETUP_BUFFER_SYNTAX_TABLE();	/* For syntax_prefix_flag_p.  */
+
   while (start < end)
     {
       int c2, len;