diff --git a/check_substitutes.py b/check_substitutes.py
index 177bf688..906ac0c7 100755
--- a/check_substitutes.py
+++ b/check_substitutes.py
@@ -57,7 +57,7 @@ class Distfile():
 
     def decompress(self):
         """Decompresses the distfile."""
-        compression = self.out_file.split('.')[-1]
+        compression = self.out_file.rsplit('.', maxsplit=1)[-1]
         decompress_func = {
             "gz": gzip.open,
             "tgz": gzip.open,
diff --git a/lib/target.py b/lib/target.py
index 3aa0d3d6..981e9b6c 100644
--- a/lib/target.py
+++ b/lib/target.py
@@ -38,7 +38,7 @@ class Target:
         mount("tmpfs", self.path, "tmpfs", f"size={size}")
         self._type = TargetType.TMPFS
 
-    # pylint: disable=too-many-arguments
+    # pylint: disable=too-many-arguments,too-many-positional-arguments
     def add_disk(self,
                  name,
                  size="16G",
diff --git a/lib/utils.py b/lib/utils.py
index 1e4f2af6..efa9550d 100755
--- a/lib/utils.py
+++ b/lib/utils.py
@@ -31,7 +31,7 @@ def run_as_root(*args, **kwargs):
         return run("sudo", *args, **kwargs)
     return run(*args, **kwargs)
 
-# pylint: disable=too-many-arguments
+# pylint: disable=too-many-arguments,too-many-positional-arguments
 def create_disk(image, disk_type, fs_type, size, bootable=False, mkfs_args=None):
     """Create a disk image, with a filesystem on it"""
     if mkfs_args is None: