diff --git a/src/buffer.c b/src/buffer.c
index 1fb95fd..21b3bc4 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1746,6 +1746,7 @@
 #endif
 #ifdef FEAT_COMPL_FUNC
     clear_string_option(&buf->b_p_cfu);
+    clear_string_option(&buf->b_p_ofu);
 #endif
 #ifdef FEAT_QUICKFIX
     clear_string_option(&buf->b_p_gp);