--- a/taskcluster/scripts/builder/build-linux.sh
+++ b/taskcluster/scripts/builder/build-linux.sh
@@ -38,17 +38,17 @@ export MOZ_CRASHREPORTER_NO_REPORT=1
 export MOZ_OBJDIR=obj-firefox
 export TINDERBOX_OUTPUT=1
 
 # use "simple" package names so that they can be hard-coded in the task's
 # extras.locations
 export MOZ_SIMPLE_PACKAGE_NAME=target
 
 # Do not try to upload symbols (see https://bugzilla.mozilla.org/show_bug.cgi?id=1164615)
-MOZ_AUTOMATION_UPLOAD_SYMBOLS=0
+export MOZ_AUTOMATION_UPLOAD_SYMBOLS=0
 
 # Ensure that in tree libraries can be found
 export LIBRARY_PATH=$LIBRARY_PATH:$WORKSPACE/src/obj-firefox:$WORKSPACE/src/gcc/lib64
 
 # test required parameters are supplied
 if [[ -z ${MOZHARNESS_SCRIPT} ]]; then fail "MOZHARNESS_SCRIPT is not set"; fi
 if [[ -z ${MOZHARNESS_CONFIG} ]]; then fail "MOZHARNESS_CONFIG is not set"; fi