diff --git a/tests/make_certificates.py b/tests/make_certificates.py
index 6fb03ac..ea14a7e 100644
--- a/tests/make_certificates.py
+++ b/tests/make_certificates.py
@@ -10,6 +10,8 @@
 from cryptography.hazmat.primitives import serialization
 from cryptography.hazmat.primitives.asymmetric import rsa
 
+import cryptography.hazmat.primitives.serialization.pkcs12
+
 RESULT_PATH = os.getcwd()
 CERTS_PATH = os.path.join(RESULT_PATH, "./Testing/certs/")