diff --git a/taskcluster/scripts/builder/build-l10n.sh b/taskcluster/scripts/builder/build-l10n.sh
index 61a3bceae5ee..18b238b16e22 100755
--- a/taskcluster/scripts/builder/build-l10n.sh
+++ b/taskcluster/scripts/builder/build-l10n.sh
@@ -28,6 +28,7 @@ echo "running as" $(id)
 : MOZ_SCM_LEVEL                 ${MOZ_SCM_LEVEL:=1}
 
 : WORKSPACE                     ${WORKSPACE:=/builds/worker/workspace}
+: MOZ_OBJDIR                    ${MOZ_OBJDIR:=$WORKSPACE/obj-build}
 
 set -v
 
@@ -66,6 +67,8 @@ fi
 # entirely effective.
 export TOOLTOOL_CACHE
 
+export MOZ_OBJDIR
+
 config_path_cmds=""
 for path in ${MOZHARNESS_CONFIG_PATHS}; do
     config_path_cmds="${config_path_cmds} --extra-config-path ${GECKO_PATH}/${path}"
diff --git a/taskcluster/scripts/builder/build-linux.sh b/taskcluster/scripts/builder/build-linux.sh
index 1931d5bab44b..037915687e5f 100755
--- a/taskcluster/scripts/builder/build-linux.sh
+++ b/taskcluster/scripts/builder/build-linux.sh
@@ -27,6 +27,7 @@ echo "running as" $(id)
 : MH_BUILD_POOL                 ${MH_BUILD_POOL:=staging}
 
 : WORKSPACE                     ${WORKSPACE:=/builds/worker/workspace}
+: MOZ_OBJDIR                    ${MOZ_OBJDIR:=$WORKSPACE/obj-build}
 
 set -v
 
@@ -81,6 +82,8 @@ fi
 # entirely effective.
 export TOOLTOOL_CACHE
 
+export MOZ_OBJDIR
+
 config_path_cmds=""
 for path in ${MOZHARNESS_CONFIG_PATHS}; do
     config_path_cmds="${config_path_cmds} --extra-config-path ${GECKO_PATH}/${path}"
diff --git a/taskcluster/scripts/builder/repackage.sh b/taskcluster/scripts/builder/repackage.sh
index 815d75e99dc3..15ddbe8557fe 100755
--- a/taskcluster/scripts/builder/repackage.sh
+++ b/taskcluster/scripts/builder/repackage.sh
@@ -23,6 +23,7 @@ echo "running as" $(id)
 : MOZ_SCM_LEVEL                 ${MOZ_SCM_LEVEL:=1}
 
 : WORKSPACE                     ${WORKSPACE:=/builds/worker/workspace}
+: MOZ_OBJDIR                    ${MOZ_OBJDIR:=$WORKSPACE/obj-build}
 
 set -v
 
@@ -62,6 +63,8 @@ fi
 # entirely effective.
 export TOOLTOOL_CACHE
 
+export MOZ_OBJDIR
+
 config_path_cmds=""
 for path in ${MOZHARNESS_CONFIG_PATHS}; do
     config_path_cmds="${config_path_cmds} --extra-config-path ${GECKO_PATH}/${path}"