diff --git a/Dockerfile b/Dockerfile
index db44683..32b03fa 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ FROM php:7.4-apache as builder
 COPY . /build
 
 RUN apt-get update \
-    && apt-get install -y build-essential \
+    && apt-get install -y build-essential zlib1g-dev \
     && cd /build \
     && make \
     && sed 's/\(^ *\)\/\/\(.*DOCKER:ENABLE\)/\1\2/g' config.php > config-docker.php