diff --git a/diskimage_builder/elements/redhat-common/finalise.d/01-clean-old-kernels b/diskimage_builder/elements/redhat-common/finalise.d/01-clean-old-kernels
index 48f835bf..5d8393f2 100755
--- a/diskimage_builder/elements/redhat-common/finalise.d/01-clean-old-kernels
+++ b/diskimage_builder/elements/redhat-common/finalise.d/01-clean-old-kernels
@@ -16,7 +16,7 @@ YUM=${YUM:-yum}
 if [[ ${YUM} == "dnf" ]]; then
     # cribbed from
     #  http://dnf.readthedocs.org/en/latest/cli_vs_yum.html
-    _old_kernels="$(dnf repoquery --installonly --latest-limit -1 -q)"
+    _old_kernels="$(dnf repoquery --installonly --latest-limit=-1 -q)"
     if [[ -n "${_old_kernels}" ]]; then
         dnf remove -y ${_old_kernels}
     fi