diff --git a/lib/PDBMapProtein.py b/lib/PDBMapProtein.py
index c6c3498..82dee28 100644
--- a/lib/PDBMapProtein.py
+++ b/lib/PDBMapProtein.py
@@ -344,7 +344,7 @@ def load_idmapping(cls, idmapping_fname):
                     hgnc = dbid  # for clarity
                     PDBMapProtein._unp2hgnc[unp] = hgnc
                     PDBMapProtein._hgnc2unp[hgnc] = unp
-                elif db == "Gene_ID":
+                elif db == "GeneID":
                     gene_id = dbid  # for clarity
                     PDBMapProtein._unp2gene_id[unp] = gene_id
                 elif db == "Ensembl_TRS":