diff --git a/Dockerfile b/Dockerfile
index 821b258..85273d0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ FROM ${ALPINE_IMAGE}:${ALPINE_VERSION} as builder
 
 ARG ZT_COMMIT
 
-RUN apk add --update alpine-sdk linux-headers \
+RUN apk add --update alpine-sdk linux-headers openssl-dev \
   && apk add cargo || true \
   && git clone --quiet https://github.com/zerotier/ZeroTierOne.git /src \
   && git -C src reset --quiet --hard ${ZT_COMMIT} \