diff --git a/addons/adb_server/Dockerfile b/addons/adb_server/Dockerfile
index 4259eaa..c6b8ea6 100644
--- a/addons/adb_server/Dockerfile
+++ b/addons/adb_server/Dockerfile
@@ -4,16 +4,14 @@ ARG BUILD_FROM
 FROM ${BUILD_FROM}
 
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends android-tools-adb wget bash && \
-    rm -rf /var/lib/apt/lists/*
-
-# Download and build TTYD
-RUN apt-get update && \
-    apt-get install -y build-essential cmake git libjson-c-dev libwebsockets-dev && \
+    apt-get install -y --no-install-recommends android-tools-adb wget bash build-essential cmake git libjson-c-dev libwebsockets-dev && \
     rm -rf /var/lib/apt/lists/* && \
-    git clone https://github.com/tsl0922/ttyd.git && \
-    cd ttyd && mkdir build && cd build && cmake ..
-RUN make && make install
+    git clone https://github.com/tsl0922/ttyd.git
+WORKDIR /ttyd
+RUN mkdir build
+WORKDIR /ttyd/build
+RUN cmake .. && \
+    make && make install
 
 COPY run.sh /run.sh
 COPY restricted-shell.sh /usr/local/bin/restricted-shell.sh