diff --git a/docker/Dockerfile b/docker/Dockerfile
index e6acfc4..9e760f3 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -35,6 +35,8 @@ RUN apt-get update \
 
 RUN mkdir -p /cache
 
+# Python mimetypes package is missing some common mappings
+COPY docker/mime.types /etc/mime.types
 COPY . /takahe
 
 WORKDIR /takahe
diff --git a/docker/mime.types b/docker/mime.types
new file mode 100644
index 0000000..15092b7
--- /dev/null
+++ b/docker/mime.types
@@ -0,0 +1 @@
+image/webp  webp