diff --git a/Dockerfile b/Dockerfile
index e92e553..8205efa 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -32,7 +32,7 @@ RUN set -e; \
       cp "${LOCAL_TARBALL}" gnunet.tar.gz; \
       tar xzf gnunet.tar.gz; \
       GNUNET_DIR="$(ls -d gnunet-* | head -1)"; \
-      if [ ! -f "${GNUNET_DIR}/meson.build" ]; then \
+      if [ ! -f "${GNUNET_DIR}/meson.build" ] || [ ! -f "${GNUNET_DIR}/doc/handbook/meson.build" ]; then \
         echo "Local tarball seems incomplete; falling back to git clone ${GNUNET_REF}"; \
         rm -rf "${GNUNET_DIR}"; \
         git clone --depth 1 --branch "${GNUNET_REF}" https://git.taler.net/gnunet.git gnunet; \
@@ -43,7 +43,7 @@ RUN set -e; \
       curl -L "${GNUNET_TARBALL_URL}" -o gnunet.tar.gz; \
       tar xzf gnunet.tar.gz; \
       GNUNET_DIR="$(ls -d gnunet-* | head -1)"; \
-      if [ ! -f "${GNUNET_DIR}/meson.build" ]; then \
+      if [ ! -f "${GNUNET_DIR}/meson.build" ] || [ ! -f "${GNUNET_DIR}/doc/handbook/meson.build" ]; then \
         echo "Tarball seems incomplete; falling back to git clone ${GNUNET_REF}"; \
         rm -rf "${GNUNET_DIR}"; \
         git clone --depth 1 --branch "${GNUNET_REF}" https://git.taler.net/gnunet.git gnunet; \