diff --git a/build.sh b/build.sh
index 68ee9bf6..12b0b879 100755
--- a/build.sh
+++ b/build.sh
@@ -7,24 +7,26 @@ CONTAINER_NAME="openwrt-builder-container"
 FIRMWARE_PATH="/home/builder/openwrt/bin/brcm963xx/zyxel/ras.bin"
 
 echo "Building Docker image ${IMAGE_NAME}..."
-docker build -t ${IMAGE_NAME} .
+docker build --platform linux/amd64 -t ${IMAGE_NAME} .
 
 echo "Starting container..."
-docker run --cpus="1" -it --name "${CONTAINER_NAME}" \
-  -e TERM=vt100 \
-  "${IMAGE_NAME}" \
-  /bin/bash -c "cd /home/builder/openwrt && \
-    ./scripts/feeds update -a && \
-    ./scripts/feeds install -a && \
-    make -j1 V=sc"
+docker run --platform linux/amd64 --cpus="1" -it --name "${CONTAINER_NAME}" -e TERM=vt100 "${IMAGE_NAME}" /bin/bash -c \
+    "cd /home/builder/openwrt && \
+     ./scripts/feeds update -a && \
+     ./scripts/feeds install -a && \
+     make PROJECT=brcm963xx clean && \
+     make PROJECT=brcm963xx -j1 V=sc"
 
 docker cp ${CONTAINER_NAME}:.config ./.config-build
 docker cp ${CONTAINER_NAME}:defconfig.log ./defconfig-build.log
 
-docker cp ${CONTAINER_NAME}:${FIRMWARE_PATH} ./build/ras.bin 2>/dev/null || {
-  echo "ERROR: Firmware not found at ${FIRMWARE_PATH}"
-  echo "The build may have failed or the output path is not ${FIRMWARE_PATH}"
-  echo "You can inspect the container manually: docker start -ai ${CONTAINER_NAME}"
-  exit 1
-}
-echo "Firmware copied to ./build/ras.bin"
+if docker cp ${CONTAINER_NAME}:${FIRMWARE_PATH} ./build/ras.bin 2>/dev/null; then
+    echo "Firmware copied to ./build/ras.bin"
+else
+    echo "ERROR: Firmware not found at ${FIRMWARE_PATH}"
+    echo "The build may have failed or the output path is not ${FIRMWARE_PATH}"
+    echo "You can inspect the container manually: docker start -ai ${CONTAINER_NAME}"
+    exit 1
+fi
+
+docker rm ${CONTAINER_NAME}