diff --git a/make_mCherry_transgene.py b/make_mCherry_transgene.py
index 7cca3308fbb84a24fc6b8c7786cfae9ca5b39fa8..165c3e9c9ac95b15bfa6caeb4669d3182bef2b1d 100755
--- a/make_mCherry_transgene.py
+++ b/make_mCherry_transgene.py
@@ -50,7 +50,7 @@ def main():
         with fs.open("mCherry_transcript.fa", "w") as transcript_file:
             transcript_file.write(f">mCherry\n{mCherry_seq}\n")
         with fs.open("mCherry.gtf", "w") as transcript_gtf_file:
-            annotations = "gene_id \"mCherry\"; transcript_id \"mCherry\"; gene_biotype \"mCherry\";"
+            annotations = "gene_id \"mCherry\"; transcript_id \"mCherry\"; gene_biotype \"protein_coding\";"
             transcript_gtf_file.write("\t".join([
                 "mCherry", "local", "transcript", "1", str(len(mCherry_seq)),
                 "0", "+", ".", annotations]))
@@ -77,7 +77,7 @@ def main():
                             "mCherry_transgene", "local", "exon", str(start_in_transgene), str(end_in_transgene),
                             "0", "+", ".", annotations]))
                         transgene_gtf_file.write("\n")
-                        annotations = f"exon_id \"mCherry.e{exon_number}\"; exon_number \"{exon_number}\"; gene_id \"mCherry\"; transcript_id \"mCherry\"; gene_biotype \"mCherry\";"
+                        annotations = f"exon_id \"mCherry.e{exon_number}\"; exon_number \"{exon_number}\"; gene_id \"mCherry\"; transcript_id \"mCherry\"; gene_biotype \"protein_coding\";"
                         transcript_gtf_file.write("\t".join([
                             "mCherry", "local", "exon", str(start_in_transcript), str(end_in_transcript),
                             "0", "+", ".", annotations]))