diff --git a/rbackup/rsync.py b/rbackup/rsync.py
index 3ccfe21..a7e9062 100644
--- a/rbackup/rsync.py
+++ b/rbackup/rsync.py
@@ -34,7 +34,7 @@ def rsync(*args):
     """
     cmd = [_RSYNC_BIN, *args]
 
-    syslog.debug(f"rsync command: {cmd}")
+    syslog.debug("rsync command: %s", cmd)
     syslog.info("Beginning rsync process")
 
     process = subprocess.run(cmd, capture_output=True, check=True, text=True)
diff --git a/rbackup/script.py b/rbackup/script.py
index 173fdfa..bb83025 100644
--- a/rbackup/script.py
+++ b/rbackup/script.py
@@ -75,6 +75,6 @@ def do_backup(repository, parsed_config, args, extra_rsync_opts=None):
             exit(E_INVALID_SNAPSHOT_NAME)
         except CalledProcessError as e:
             syslog.critical("Backup process failed")
-            syslog.critical(f"Failing command: {e.cmd}")
+            syslog.critical("Failing command: %s", e.cmd)
             syslog.critical(e.stderr)
             exit(e.returncode)
diff --git a/rbackup/struct/hierarchy.py b/rbackup/struct/hierarchy.py
index fff85ad..7c8965b 100644
--- a/rbackup/struct/hierarchy.py
+++ b/rbackup/struct/hierarchy.py
@@ -101,7 +101,7 @@ class Hierarchy(os.PathLike):
     def cleanup(self, **kwargs):
         """Clean up this Hierarchy's data from the filesystem."""
 
-        syslog.info(f"Performing cleanup on {self._path}")
+        syslog.info("Performing cleanup on %s", self._path)
 
         # We don't want to risk symlink attacks
         # noinspection PyUnresolvedReferences
@@ -119,7 +119,7 @@ class Hierarchy(os.PathLike):
 
         :rtype: type that the data is serialized as
         """
-        syslog.debug(f"Reading metadata from {self.metadata_path}")
+        syslog.debug("Reading metadata from %s", self.metadata_path)
         with self.metadata_path.open(mode=METADATA_READ) as mfile:
             return json.load(mfile)
 
@@ -131,7 +131,7 @@ class Hierarchy(os.PathLike):
         :param attr: class data to write to file
         :type attr: any type
         """
-        syslog.debug(f"Writing metadata to {self.metadata_path}")
+        syslog.debug("Writing metadata to %s", self.metadata_path)
 
         tmpfile = self.metadata_path.with_suffix(".tmp")
 
diff --git a/rbackup/struct/repository.py b/rbackup/struct/repository.py
index 1b82b9f..8382fd5 100644
--- a/rbackup/struct/repository.py
+++ b/rbackup/struct/repository.py
@@ -232,7 +232,7 @@ class Repository(Hierarchy):
         self.metadata_path.unlink()
         self.snapshot_symlink.unlink()
         syslog.info("Removing repository metadata")
-        syslog.debug(f"Repository metadata removed: {self.metadata_path}")
+        syslog.debug("Repository metadata removed: %s", self.metadata_path)
 
         if remove_snapshots:
             try:
@@ -248,7 +248,7 @@ class Repository(Hierarchy):
             except PermissionError as e:
                 syslog.error(e)
             else:
-                syslog.info(f"Removed repository directory: {self.path}")
+                syslog.info("Removed repository directory: %s", self.path)
 
     def create_snapshot(self, name=None):
         """Create a new snapshot in this repository.
@@ -295,7 +295,7 @@ class Repository(Hierarchy):
             self.write_metadata(self._snapshot_metadata)
 
             syslog.debug("Snapshot created")
-            syslog.debug(f"Snapshot name: {new_snapshot.name}")
+            syslog.debug("Snapshot name: %s", new_snapshot.name)
 
             self.symlink_snapshot(new_snapshot)
             return new_snapshot