diff --git a/PTL1/Transcriptomes/Scripts/3_AssignOGs.py b/PTL1/Transcriptomes/Scripts/3_AssignOGs.py
index cfc052a..95b48fa 100644
--- a/PTL1/Transcriptomes/Scripts/3_AssignOGs.py
+++ b/PTL1/Transcriptomes/Scripts/3_AssignOGs.py
@@ -246,7 +246,7 @@ def update_fasta(args):
 	for line in keep:
 		try:
 			og_number = re.split('OG.{1}_', line.split('\t')[1])[1][:6]
-			og_prefix = line.split('\t')[1].split(og_number)[-1][-4:]
+			og_prefix = line.split('\t')[1].split(og_number)[-2][-4:]
 			og = og_prefix + og_number
 
 			keep_dict.update({ re.split('_OG.{1}_', line.split('\t')[0])[0]  : re.split('_OG.{1}_', line.split('\t')[0])[0] + '_' + og_prefix + line.split('\t')[1].split('_')[-1] })