diff --git a/Dockerfile b/Dockerfile
index 75b0c78..448ec5a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,8 @@ RUN apk add --no-cache \
         build-base \
         cvs \
         git \
-        zlib-dev
+        zlib-dev \
+        zlib-static
 
 RUN cvs -d :pserver:cvs@cvs.fefe.de:/cvs -z9 co libowfat \
     && cd libowfat \