diff --git a/python/obitools3/commands/uniq.pyx b/python/obitools3/commands/uniq.pyx
index 3b8cc22..a9c4f62 100644
--- a/python/obitools3/commands/uniq.pyx
+++ b/python/obitools3/commands/uniq.pyx
@@ -307,8 +307,8 @@ cdef uniq_sequences(View_NUC_SEQS view, View_NUC_SEQS o_view, ProgressBar pb, di
         for x in categories :
             catl.append(i_seq[x])    
           
-        unique_id = tuple(catl) + (i_seq_col[i],)
-        #unique_id = tuple(catl) + (i_seq_col.get_line_idx(i),)
+        #unique_id = tuple(catl) + (i_seq_col[i],)
+        unique_id = tuple(catl) + (i_seq_col.get_line_idx(i),)
         #unique_id = tuple(i_seq[x] for x in categories) + (seq_col.get_line_idx(i),)  # The line that cython can't read properly
          
         if unique_id in uniques:
diff --git a/src/obiavl.c b/src/obiavl.c
index facf20c..16ef574 100755
--- a/src/obiavl.c
+++ b/src/obiavl.c
@@ -2259,7 +2259,13 @@ index_t obi_avl_add(OBIDMS_avl_p avl, Obi_blob_p value)
 		parent = next;
 
 		// Compare the crc of the value with the crc of the current node
-		comp = (current_node->crc64) - crc;
+		//comp = (current_node->crc64) - crc;
+		if ((current_node->crc64) == crc)
+			comp = 0;
+		else if ((current_node->crc64) > crc)
+			comp = 1;
+		else
+			comp = -1;
 
 		if (comp == 0)
 		{ // check if really same value
@@ -2354,7 +2360,13 @@ index_t obi_avl_find(OBIDMS_avl_p avl, Obi_blob_p value)
 		current_node = (avl->tree)+next;
 
 		// Compare the crc of the value with the crc of the current node
-		comp = (current_node->crc64) - crc;
+		//comp = (current_node->crc64) - crc;
+		if ((current_node->crc64) == crc)
+			comp = 0;
+		else if ((current_node->crc64) > crc)
+			comp = 1;
+		else
+			comp = -1;
 
 		if (comp == 0)
 		{ // Check if really same value