diff --git a/util/ci/ubuntu-18.04-docker b/util/ci/ubuntu-18.04-docker
index 97fcfb3fab..4e6bf8735c 100644
--- a/util/ci/ubuntu-18.04-docker
+++ b/util/ci/ubuntu-18.04-docker
@@ -11,7 +11,7 @@ run apt-get update -y
 run DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends apt-utils
 run DEBIAN_FRONTEND=noninteractive apt-get upgrade -y
 run DEBIAN_FRONTEND=noninteractive apt-get build-dep -y gnucash
-run DEBIAN_FRONTEND=noninteractive apt-get install -y git bash-completion cmake make swig xsltproc libdbd-sqlite3 texinfo ninja-build libboost-all-dev libgtk-3-dev libwebkit2gtk-4.0-dev tzdata googletest
+run DEBIAN_FRONTEND=noninteractive apt-get install -y git bash-completion cmake make swig xsltproc libdbd-sqlite3 texinfo ninja-build libboost-all-dev libgtk-3-dev libgwengui-gtk3-dev libwebkit2gtk-4.0-dev tzdata googletest
 run DEBIAN_FRONTEND=noninteractive apt-get --reinstall install -y language-pack-en language-pack-fr
 copy ubuntu-18.04-testscript afterfailure commonbuild /
 run chmod +x /ubuntu-18.04-testscript /afterfailure /commonbuild