diff --git a/pmb/config/init.py b/pmb/config/init.py
index e3e92be1..278b0503 100644
--- a/pmb/config/init.py
+++ b/pmb/config/init.py
@@ -357,7 +357,7 @@ def frontend(args):
                  " or \"none\"")
     extra = pmb.helpers.cli.ask(args, "Extra packages", None,
                                 args.extra_packages,
-                                validation_regex="^([-.+\w]+)(,[-.+\w]+)*$")
+                                validation_regex=r"^([-.+\w]+)(,[-.+\w]+)*$")
     cfg["pmbootstrap"]["extra_packages"] = extra
 
     # Configure timezone info
diff --git a/pmb/install/_install.py b/pmb/install/_install.py
index cb8dbf0c..a4a022db 100644
--- a/pmb/install/_install.py
+++ b/pmb/install/_install.py
@@ -170,7 +170,7 @@ def configure_apk(args):
         pmb.helpers.run.root(args, ["cp", key, rootfs + "/etc/apk/keys/"])
 
     # Disable pmbootstrap repository
-    pmb.helpers.run.root(args, ["sed", "-i", "/\/mnt\/pmbootstrap-packages/d",
+    pmb.helpers.run.root(args, ["sed", "-i", r"/\/mnt\/pmbootstrap-packages/d",
                                 rootfs + "/etc/apk/repositories"])
     pmb.helpers.run.user(args, ["cat", rootfs + "/etc/apk/repositories"])
 
@@ -281,7 +281,7 @@ def setup_hostname(args):
     suffix = "rootfs_" + args.device
     pmb.chroot.root(args, ["sh", "-c", "echo " + shlex.quote(hostname) +
                            " > /etc/hostname"], suffix)
-    regex = ("s/^127\.0\.0\.1.*/127.0.0.1\t" + re.escape(hostname) +
+    regex = (r"s/^127\.0\.0\.1.*/127.0.0.1\t" + re.escape(hostname) +
              " localhost.localdomain localhost/")
     pmb.chroot.root(args, ["sed", "-i", "-e", regex, "/etc/hosts"], suffix)