diff --git a/build.sh b/build.sh
index f790077e..31e0519f 100755
--- a/build.sh
+++ b/build.sh
@@ -7,7 +7,10 @@ if [ -d ".git" ]
 then
     export BUILD=`git rev-parse --short HEAD || ""`
     export BRANCH=`(git symbolic-ref --short HEAD | tr -d \/ ) || ""`
-    [[ $BRANCH == "master" ]] && export BRANCH=""
+    if [[ $BRANCH == "master" ]]
+    then
+        export BRANCH=""
+    fi
 
     export FLAGS="-X github.com/matrix-org/dendrite/internal.branch=$BRANCH -X github.com/matrix-org/dendrite/internal.build=$BUILD"
 else