diff --git a/full/Dockerfile b/full/Dockerfile
index 409bf55..6ce778b 100644
--- a/full/Dockerfile
+++ b/full/Dockerfile
@@ -1,5 +1,8 @@
 FROM znc:slim
 
+# I don't know what it should do. It works for me without this line, but not for @tianon
+USER root
+
 # znc:slim removed them. Install them again.
 RUN set -x \
     && apk add --no-cache \
@@ -9,3 +12,6 @@ RUN set -x \
         perl \
         python3
 COPY znc-build-modules.sh /
+
+# Revert the USER root line above
+USER znc