diff --git a/src/memline.c b/src/memline.c
index e7ae6df..6449b3c 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -2738,7 +2738,7 @@
     return ml_append_int(curbuf, lnum, line, len, newfile, FALSE);
 }
 
-#if defined(FEAT_SPELL) || defined(FEAT_QUICKFIX) || defined(PROTO)
+#if defined(FEAT_SPELL) || defined(FEAT_QUICKFIX) || defined(PROTO) || defined(FEAT_TEXT_PROP)
 /*
  * Like ml_append() but for an arbitrary buffer.  The buffer must already have
  * a memline.