diff --git a/source3/smbd/reply.c b/source3/smbd/reply.c
index 5cdc59b..4f46189 100644
--- a/source3/smbd/reply.c
+++ b/source3/smbd/reply.c
@@ -3263,14 +3263,20 @@ static void send_file_readX(connection_struct *conn, struct smb_request *req,
 		return;
 	}
 
-	if (startpos > sbuf.st_size) {
-		smb_maxcnt = 0;
-	} else if (smb_maxcnt > (sbuf.st_size - startpos)) {
-		smb_maxcnt = (sbuf.st_size - startpos);
-	}
+	if (S_ISREG(sbuf.st_mode)) {
+		/* Only change the client values for a normal file. */
+		if (startpos > sbuf.st_size) {
+			smb_maxcnt = 0;
+		} else if (smb_maxcnt > (sbuf.st_size - startpos)) {
+			smb_maxcnt = (sbuf.st_size - startpos);
+		}
 
-	if (smb_maxcnt == 0) {
-		goto normal_read;
+		if (smb_maxcnt == 0) {
+			goto normal_read;
+		}
+	} else {
+		/* Pipe or device read. */
+		goto normal_nosendfile_read;
 	}
 
 #if defined(WITH_SENDFILE)
@@ -3386,6 +3392,8 @@ normal_read:
 		return;
 	}
 
+normal_nosendfile_read:
+
 	reply_outbuf(req, 12, smb_maxcnt);
 
 	nread = read_file(fsp, smb_buf(req->outbuf), startpos, smb_maxcnt);