diff --git a/psm_utils/io/__init__.py b/psm_utils/io/__init__.py
index 0b4bb66..28021c5 100644
--- a/psm_utils/io/__init__.py
+++ b/psm_utils/io/__init__.py
@@ -105,13 +105,13 @@
         "reader": sage.SageTSVReader,
         "writer": None,
         "extension": ".tsv",
-        "filename_pattern": r"^.*(?:_|\.).sage.tsv$",
+        "filename_pattern": r"^.*(?:_|\.)sage.tsv$",
     },
     "sage_parquet": {
         "reader": sage.SageParquetReader,
         "writer": None,
         "extension": ".parquet",
-        "filename_pattern": r"^.*(?:_|\.).sage.parquet$",
+        "filename_pattern": r"^.*(?:_|\.)sage.parquet$",
     },
     "parquet": {  # List after proteoscape and sage to avoid extension matching conflicts
         "reader": parquet.ParquetReader,