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-rw-r--r--docker/build_debian.sh2
1 files changed, 1 insertions, 1 deletions
diff --git a/docker/build_debian.sh b/docker/build_debian.sh
index 1d0be42cfc..32ad07a0cc 100644
--- a/docker/build_debian.sh
+++ b/docker/build_debian.sh
@@ -5,7 +5,7 @@
 set -ex
 
 # Get the codename from distro env
-DIST=`cut -d ':' -f2 <<< ${distro:?}`
+DIST=`cut -d ':' -f2 <<< "${distro:?}"`
 
 # we get a read-only copy of the source: make a writeable copy
 cp -aT /synapse/source /synapse/build