diff --git a/t/test-lib.sh b/t/test-lib.sh
index fc93aa57e6..042f557a6f 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1297,6 +1297,11 @@ test_done () {
 		EOF
 	fi
 
+	if test -z "$passes_sanitize_leak" && test_bool_env TEST_PASSES_SANITIZE_LEAK false
+	then
+		BAIL_OUT "Please, set TEST_PASSES_SANITIZE_LEAK before sourcing test-lib.sh"
+	fi
+
 	if test "$test_fixed" != 0
 	then
 		say_color error "# $test_fixed known breakage(s) vanished; please update test(s)"