diff --git a/Dockerfile.trunk b/Dockerfile.trunk
index d100fa5386a3a1e114b577c98aa2a5646dd5db63..e7dd53786c2a0d33ac7e47ffd22d2d0d01e915a8 100644
--- a/Dockerfile.trunk
+++ b/Dockerfile.trunk
@@ -20,8 +20,6 @@ RUN apk add --no-cache \
   qt5-qtbase-postgresql \
   qt5-qtbase-sqlite
 
-ARG QUASSEL_VERSION="0.13.1"
-
 # setup repo
 RUN mkdir /quassel && \
     git clone -b master --single-branch https://github.com/quassel/quassel /quassel/src && \