--- a/textio/txInput.c
+++ b/textio/txInput.c
@@ -562,7 +562,7 @@ magic_completion_function(
     int start,
     int end)
 {
-    CPFunction *completion_func = (CPFunction *)NULL;
+    rl_compentry_func_t *completion_func = NULL;
     char **matches, **tokens;
     char *line = strdup(rl_line_buffer);
     int i;
--- a/textio/txMain.c
+++ b/textio/txMain.c
@@ -123,7 +123,7 @@ TxInitReadline(void)
     /* removed "=" and "(" because styles contain them */
     rl_completer_word_break_characters = " \t\n\"\\'`@$><;|&{";
 
-    rl_attempted_completion_function = (CPPFunction *)magic_completion_function;
+    rl_attempted_completion_function = (rl_completion_func_t *)magic_completion_function;
     HashInit(&cellname_hash, 128, HT_STRINGKEYS);
 
     i = j = 0;