diff --git a/caddy/7.4/Dockerfile b/caddy/7.4/Dockerfile
index 650d0aa..0ea377d 100644
--- a/caddy/7.4/Dockerfile
+++ b/caddy/7.4/Dockerfile
@@ -11,7 +11,7 @@ RUN rm -rf /etc/localtime \
 
 # 国内源
 RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories \
-    && RUN apk add --no-cache ca-certificates mailcap \
+    && apk add --no-cache ca-certificates mailcap \
     && set -eux \
 	&& mkdir -p \
 		/config/caddy \