diff --git a/src/buffer.c b/src/buffer.c
index 740d31b..2502dee 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -2702,6 +2702,15 @@
 	    {
 		if (!buf->b_p_bl)	// skip unlisted buffers
 		    continue;
+#ifdef FEAT_DIFF
+		if (options & BUF_DIFF_FILTER)
+		    // Skip buffers not suitable for
+		    // :diffget or :diffput completion.
+		    if (buf == curbuf
+			    || !diff_mode_buf(curbuf) || !diff_mode_buf(buf))
+			continue;
+#endif
+
 		p = buflist_match(&regmatch, buf, p_wic);
 		if (p != NULL)
 		{