diff --git a/src/option.c b/src/option.c
index b807b9b..4422634 100644
--- a/src/option.c
+++ b/src/option.c
@@ -810,6 +810,7 @@
 	    clear_string_option((char_u **)options[i].var);
     }
     free_operatorfunc_option();
+    free_tagfunc_option();
 }
 #endif
 
@@ -5956,6 +5957,7 @@
 #ifdef FEAT_EVAL
 	    buf->b_p_tfu = vim_strsave(p_tfu);
 	    COPY_OPT_SCTX(buf, BV_TFU);
+	    buf_set_tfu_callback(buf);
 #endif
 	    buf->b_p_sts = p_sts;
 	    COPY_OPT_SCTX(buf, BV_STS);