diff --git a/Containers/clamav/Dockerfile b/Containers/clamav/Dockerfile
index f024c124..5816a498 100644
--- a/Containers/clamav/Dockerfile
+++ b/Containers/clamav/Dockerfile
@@ -1,7 +1,10 @@
-# Probably from this file: https://github.com/Cisco-Talos/clamav-docker/blob/main/clamav/0.105/alpine/Dockerfile
+# Probably from this file: https://github.com/Cisco-Talos/clamav-docker/blob/main/clamav/1.1/alpine/Dockerfile
 FROM clamav/clamav:1.1.0-1
 
-RUN apk add --no-cache tzdata
-COPY clamav.conf /tmp/
-RUN cat /tmp/clamav.conf >> /etc/clamav/clamd.conf
+COPY clamav.conf /tmp/clamav.conf
+
+RUN set -ex; \
+    apk add --no-cache tzdata; \
+    cat /tmp/clamav.conf | tee -a /etc/clamav/clamd.conf; \
+    rm /tmp/clamav.conf
 LABEL com.centurylinklabs.watchtower.monitor-only="true"