diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
index cea5d93b..06a8cff0 100644
--- a/Dockerfile-debian.template
+++ b/Dockerfile-debian.template
@@ -41,6 +41,7 @@ RUN set -ex; \
         libwebp-dev \
         libxml2-dev \
         libzip-dev \
+        ffmpeg \
     ; \
     \
     debMultiarch="$(dpkg-architecture --query DEB_BUILD_MULTIARCH)"; \