diff --git a/tests/settings/environment.sh b/tests/settings/environment.sh
index 79107c3..b11b9da 100644
--- a/tests/settings/environment.sh
+++ b/tests/settings/environment.sh
@@ -23,6 +23,6 @@
 #
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-export USE_LOSETUP=""
-export USING_PINENTRY=""
-export CLEAR_GPG_AGENTS_CACHE=1
+export USE_LOSETUP="${USE_LOSETUP:-}"
+export USING_PINENTRY="${USING_PINENTRY:-}"
+export CLEAR_GPG_AGENTS_CACHE="${CLEAR_GPG_AGENTS_CACHE:-1}"