diff --git a/tests/libtest.sh b/tests/libtest.sh
index 8f415b48..31169a6b 100644
--- a/tests/libtest.sh
+++ b/tests/libtest.sh
@@ -80,6 +80,7 @@ mkdir -p ${TEST_DATA_DIR}/system
 export FLATPAK_SYSTEM_DIR=${TEST_DATA_DIR}/system
 export FLATPAK_SYSTEM_HELPER_ON_SESSION=1
 
+export XDG_CACHE_HOME=${TEST_DATA_DIR}/home/cache
 export XDG_DATA_HOME=${TEST_DATA_DIR}/home/share
 export XDG_RUNTIME_DIR=${TEST_DATA_DIR}/runtime