diff --git a/diskimage_builder/elements/debootstrap/README.rst b/diskimage_builder/elements/debootstrap/README.rst
index ad69a8c1..e0e32ab0 100644
--- a/diskimage_builder/elements/debootstrap/README.rst
+++ b/diskimage_builder/elements/debootstrap/README.rst
@@ -56,7 +56,7 @@ tarball.
 
 The ``DIB_DEBOOTSTRAP_EXTRA_ARGS`` environment variable may be used to
 pass extra arguments to the debootstrap command used to create the
-base filesystem image. If --keyring is is used in ``DIB_DEBOOTSTRAP_EXTRA_ARGS``,
+base filesystem image. If --keyring is used in ``DIB_DEBOOTSTRAP_EXTRA_ARGS``,
 it will override ``DIB_APT_KEYRING`` if that is used as well.
 
 For further information about ``DIB_DEBIAN_DEBOOTSTRAP_SCRIPT`` ,