diff --git a/docker/run-appimage-build.sh b/docker/run-appimage-build.sh
index 52bd6d3d..54777116 100755
--- a/docker/run-appimage-build.sh
+++ b/docker/run-appimage-build.sh
@@ -1,26 +1,27 @@
 #! /bin/bash
 
 set -e
 
 if [ "$1" = "--devel" ]; then
     devmode=
 else
     devmode="/build-appimage.sh"
 fi
 
 sourcedir=$(cd $(dirname $0)/..; pwd)
 
-if [ -n "$devmode" ]; then
+if [ -z "$devmode" ]; then
     buildroot="/tmp/appimage-gnupg.$(id -un).d"
+    [ -d "$buildroot" ] || mkdir "$buildroot"
 else
     buildroot=$(mktemp -d --tmpdir appimage-gnupg.XXXXXXXXXX)
 fi
 echo Using ${buildroot}
 
 
 docker run -it --rm --user "$(id -u):$(id -g)" \
     --volume ${sourcedir}:/src \
     --volume ${buildroot}:/build \
     g10-build-appimage-kleopatra:centos7 $devmode
 
 echo "You can find the AppImage in ${buildroot} (if the build succeeded)."