diff --git a/can/io/logger.py b/can/io/logger.py
index 09312101b..a254fb146 100644
--- a/can/io/logger.py
+++ b/can/io/logger.py
@@ -105,6 +105,10 @@ def compress(
         File will automatically recompress upon close.
         """
         real_suffix = pathlib.Path(filename).suffixes[-2].lower()
+        if real_suffix in (".blf", ".db"):
+            raise ValueError(
+                f"The file type {real_suffix} is currently incompatible with gzip."
+            )
         if kwargs.get("append", False):
             mode = "ab" if real_suffix == ".blf" else "at"
         else: