diff --git a/src/buffer.c b/src/buffer.c
index b79e277..b2c914d 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -2153,6 +2153,7 @@
 #if defined(FEAT_CRYPT)
     clear_string_option(&buf->b_p_cm);
 #endif
+    clear_string_option(&buf->b_p_fp);
 #if defined(FEAT_EVAL)
     clear_string_option(&buf->b_p_fex);
 #endif