diff --git a/Dockerfile-unit.template b/Dockerfile-unit.template
index 0095b351..0a54952e 100644
--- a/Dockerfile-unit.template
+++ b/Dockerfile-unit.template
@@ -51,11 +51,13 @@ RUN set -ex; \
     ; \
     \
     debMultiarch="$(dpkg-architecture --query DEB_BUILD_MULTIARCH)"; \
+    docker-php-ext-configure ftp --with-openssl-dir=/usr; \
     docker-php-ext-configure gd --with-freetype --with-jpeg --with-webp; \
     docker-php-ext-configure ldap --with-libdir="lib/$debMultiarch"; \
     docker-php-ext-install -j "$(nproc)" \
         bcmath \
         exif \
+        ftp \
         gd \
         gmp \
         intl \