diff --git a/btrbk b/btrbk
index 83b2378..f7fdf55 100755
--- a/btrbk
+++ b/btrbk
@@ -3899,9 +3899,8 @@ sub check_file($$;@)
     return undef;
   }
   if($sanitize) {
-    $file =~ s/\/+/\//g;     # sanitize multiple slash
-    $file =~ s/\/\.\//\//g;  # sanitize "/./" -> "/"
-    $file =~ s/\/\.$/\//;    # sanitize trailing "/." -> "/"
+    $file =~ s/\/(\.?\/)+/\//g;  # sanitize "//", "/./" -> "/"
+    $file =~ s/\/\.$/\//;        # sanitize trailing "/." -> "/"
     $file =~ s/\/$// unless($file eq '/');   # remove trailing slash
   }
   return $file;