diff --git a/Dockerfile b/Dockerfile
index eeff38e48b..fd0b5e1c9f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -65,8 +65,8 @@ RUN apt-get update \
 	&& corepack enable \
 	&& groupadd -g "${GID}" misskey \
 	&& useradd -l -u "${UID}" -g "${GID}" -m -d /misskey misskey \
-	&& find / -type f -perm /u+s -ignore_readdir_race -exec chmod u-s {} \; \
-	&& find / -type f -perm /g+s -ignore_readdir_race -exec chmod g-s {} \; \
+	&& find / -type d -path /proc -prune -o -type f -perm /u+s -ignore_readdir_race -exec chmod u-s {} \; \
+	&& find / -type d -path /proc -prune -o -type f -perm /g+s -ignore_readdir_race -exec chmod g-s {} \; \
 	&& apt-get clean \
 	&& rm -rf /var/lib/apt/lists