diff --git a/Makefile b/Makefile
index 6e278b3..287bb7c 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ SCRIPTS=./scripts
 SOURCE=./src
 DATA=./data
 VERSION := $(shell grep version seqfu.nimble  | grep  -o "[0-9]\\+\.[0-9]\\+\.[0-9]\\+")
-NIMPARAM :=  --gc:arc -d:NimblePkgVersion=$(VERSION) -d:release --opt:speed 
+NIMPARAM :=  --gc:orc -d:NimblePkgVersion=$(VERSION) -d:release --opt:speed 
 TARGETS=$(BIN)/seqfu $(BIN)/fu-msa $(BIN)/fu-primers $(BIN)/dadaist2-mergeseqs $(BIN)/fu-shred $(BIN)/fu-homocomp $(BIN)/fu-multirelabel $(BIN)/fu-index $(BIN)/fu-cov $(BIN)/fu-16Sregion  $(BIN)/fu-nanotags  $(BIN)/fu-orf  $(BIN)/fu-sw  $(BIN)/fu-virfilter  $(BIN)/fu-tabcheck $(BIN)/byteshift $(BIN)/SeqCountHelper $(BIN)/fu-secheck
 PYTARGETS=$(BIN)/fu-split $(BIN)/fu-pecheck $(BIN)/fu-readtope
 
diff --git a/seqfu.nimble b/seqfu.nimble
index a5e68eb..8a10fd4 100644
--- a/seqfu.nimble
+++ b/seqfu.nimble
@@ -1,5 +1,5 @@
 # Package
-version       = "1.20.2"
+version       = "1.20.3"
 author        = "Andrea Telatin"
 description   = "SeqFu command-line tools"
 license       = "MIT"
diff --git a/src/dadaist2_mergeseqs.nim b/src/dadaist2_mergeseqs.nim
index 95ae90b..ec7ded0 100644
--- a/src/dadaist2_mergeseqs.nim
+++ b/src/dadaist2_mergeseqs.nim
@@ -1,7 +1,7 @@
 import parsecsv, strutils, strformat
 import docopt
 import os
-import checksums/md5
+import md5
 #import posix
 import ./seqfu_utils
 
diff --git a/src/fastx_derep.nim b/src/fastx_derep.nim
index 7c4a1b6..755fe35 100644
--- a/src/fastx_derep.nim
+++ b/src/fastx_derep.nim
@@ -1,6 +1,6 @@
 import klib
 import re
-import checksums/md5
+import md5
 import json
 import tables, strutils
 from os import fileExists
diff --git a/src/seqfu_utils.nim b/src/seqfu_utils.nim
index 3260dff..2fbc2b2 100644
--- a/src/seqfu_utils.nim
+++ b/src/seqfu_utils.nim
@@ -347,7 +347,7 @@ proc print_seq*(record: FastxRecord, outputFile: File) =
     name = record.name
     seqstring : string
 
-  if not stripComments:
+  if not stripComments and len(record.comment) > 0:
     name.add(" " & record.comment)
 
   if len(record.qual) > 0 and (len(record.seq) != len(record.qual)):