diff --git a/bullseye/Dockerfile b/bullseye/Dockerfile
index 1d81c32..b736264 100644
--- a/bullseye/Dockerfile
+++ b/bullseye/Dockerfile
@@ -30,6 +30,7 @@ RUN set -x \
         libicu-dev \
         unzip \
         git \
+        patch \
 	&& mkdir -p "${STEAMAPPDIR}" \
 	# Add entry script
 	&& chmod +x "${HOMEDIR}/entry.sh" \