diff --git a/assemblers/org.osbuild.rawfs b/assemblers/org.osbuild.rawfs
index 8b5f16bf..894e3f5a 100755
--- a/assemblers/org.osbuild.rawfs
+++ b/assemblers/org.osbuild.rawfs
@@ -78,8 +78,8 @@ def main(tree, output_dir, options, loop_client):
     size = options["size"]
     fs_type = options.get("fs_type", "ext4")
 
-    image = f"/var/tmp/osbuild-image.raw"
-    mountpoint = f"/tmp/osbuild-mnt"
+    image = "/var/tmp/osbuild-image.raw"
+    mountpoint = "/tmp/osbuild-mnt"
 
     subprocess.run(["truncate", "--size", str(size), image], check=True)
 
diff --git a/sources/org.osbuild.ostree b/sources/org.osbuild.ostree
index 069ebde5..6026d9a1 100755
--- a/sources/org.osbuild.ostree
+++ b/sources/org.osbuild.ostree
@@ -9,7 +9,7 @@ import uuid
 
 def ostree(*args, _input=None, **kwargs):
     args = list(args) + [f'--{k}={v}' for k, v in kwargs.items()]
-    print(f"ostree " + " ".join(args), file=sys.stderr)
+    print("ostree " + " ".join(args), file=sys.stderr)
     subprocess.run(["ostree"] + args,
                    encoding="utf-8",
                    stdout=sys.stderr,
diff --git a/stages/org.osbuild.ostree b/stages/org.osbuild.ostree
index e4b255bc..751592fc 100755
--- a/stages/org.osbuild.ostree
+++ b/stages/org.osbuild.ostree
@@ -132,7 +132,7 @@ SCHEMA = """
 
 def ostree(*args, _input=None, **kwargs):
     args = list(args) + [f'--{k}={v}' for k, v in kwargs.items()]
-    print(f"ostree " + " ".join(args), file=sys.stderr)
+    print("ostree " + " ".join(args), file=sys.stderr)
     subprocess.run(["ostree"] + args,
                    encoding="utf-8",
                    stdout=sys.stderr,
diff --git a/stages/org.osbuild.systemd b/stages/org.osbuild.systemd
index c9ff2094..465f2f44 100755
--- a/stages/org.osbuild.systemd
+++ b/stages/org.osbuild.systemd
@@ -44,13 +44,13 @@ def main(tree, options):
     default_target = options.get("default_target")
 
     for service in enabled_services:
-        subprocess.run([f"systemctl", "--root", tree, "enable", service], check=True)
+        subprocess.run(["systemctl", "--root", tree, "enable", service], check=True)
 
     for service in disabled_services:
-        subprocess.run([f"systemctl", "--root", tree, "disable", service], check=True)
+        subprocess.run(["systemctl", "--root", tree, "disable", service], check=True)
 
     if default_target:
-        subprocess.run([f"systemctl", "--root", tree, "set-default", default_target], check=True)
+        subprocess.run(["systemctl", "--root", tree, "set-default", default_target], check=True)
 
     return 0