diff --git a/assets/schema_input.json b/assets/schema_input.json
index 3814472..71bc452 100644
--- a/assets/schema_input.json
+++ b/assets/schema_input.json
@@ -16,7 +16,7 @@
             "contigs": {
                 "type": "string",
                 "format": "file-path",
-                "pattern": "^\\S+\\.f(ast|n)?a\\.gz$",
+                "pattern": "^\\S+\\.f(ast|n)?a(\\.gz)?$",
                 "errorMessage": "FASTA file containing assembled contigs, cannot contain spaces and must have extension '.fa.gz' or '.fasta.gz'"
             },
             "species": {