diff --git a/python/obitools3/commands/uniq.pyx b/python/obitools3/commands/uniq.pyx
index 36ff184..6ec3e7e 100644
--- a/python/obitools3/commands/uniq.pyx
+++ b/python/obitools3/commands/uniq.pyx
@@ -23,7 +23,9 @@ from cpython.exc cimport PyErr_CheckSignals
 
 
 __title__="Group sequence records together"
- 
+
+
+REVERSE_QUALITY_COLUMN_NAME = b"REVERSE_QUALITY"   # TODO from ngsfilter, move to C
 
  
 def addOptions(parser):
@@ -491,9 +493,11 @@ cdef uniq_sequences(View_NUC_SEQS view, View_NUC_SEQS o_view, ProgressBar pb, li
 
         o_idx += 1
     
-    # Deletes quality column if there is one because the matching between sequence and quality will be broken (quality set to NA when sequence not)
+    # Deletes quality columns if there is one because the matching between sequence and quality will be broken (quality set to NA when sequence not)
     if QUALITY_COLUMN in view:
         o_view.delete_column(QUALITY_COLUMN)
+    if REVERSE_QUALITY_COLUMN_NAME in view:
+        o_view.delete_column(REVERSE_QUALITY_COLUMN_NAME)
     
     if taxonomy is not None:
         print("")  # TODO because in the middle of progress bar. Better solution?