diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 7e3b3a0..936ef13 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -1569,17 +1569,17 @@
 
 # Generate signing cert
 pkcs7-rsa-sha256-1.crt:
-	$(OPENSSL) req -x509 -subj="/C=NL/O=PKCS7/CN=PKCS7 Cert 1" -sha256 -nodes -days 365  -newkey rsa:2048 -keyout pkcs7-rsa-sha256-1.key -out pkcs7-rsa-sha256-1.crt
+	$(OPENSSL) req -x509 -subj="/C=NL/O=PKCS7/CN=PKCS7 Cert 1" -sha256 -nodes -days 3653  -newkey rsa:2048 -keyout pkcs7-rsa-sha256-1.key -out pkcs7-rsa-sha256-1.crt
 	cat pkcs7-rsa-sha256-1.crt pkcs7-rsa-sha256-1.key > pkcs7-rsa-sha256-1.pem
 all_final += pkcs7-rsa-sha256-1.crt
 
 pkcs7-rsa-sha256-2.crt:
-	$(OPENSSL) req -x509 -subj="/C=NL/O=PKCS7/CN=PKCS7 Cert 2" -sha256 -nodes -days 365  -newkey rsa:2048 -keyout pkcs7-rsa-sha256-2.key -out pkcs7-rsa-sha256-2.crt
+	$(OPENSSL) req -x509 -subj="/C=NL/O=PKCS7/CN=PKCS7 Cert 2" -sha256 -nodes -days 3653  -newkey rsa:2048 -keyout pkcs7-rsa-sha256-2.key -out pkcs7-rsa-sha256-2.crt
 	cat pkcs7-rsa-sha256-2.crt pkcs7-rsa-sha256-2.key > pkcs7-rsa-sha256-2.pem
 all_final += pkcs7-rsa-sha256-2.crt
 
 pkcs7-rsa-sha256-3.crt:
-	$(OPENSSL) req -x509 -subj="/C=NL/O=PKCS7/CN=PKCS7 Cert 3" -sha256 -nodes -days 365  -newkey rsa:2048 -keyout pkcs7-rsa-sha256-3.key -out pkcs7-rsa-sha256-3.crt
+	$(OPENSSL) req -x509 -subj="/C=NL/O=PKCS7/CN=PKCS7 Cert 3" -sha256 -nodes -days 3653  -newkey rsa:2048 -keyout pkcs7-rsa-sha256-3.key -out pkcs7-rsa-sha256-3.crt
 	cat pkcs7-rsa-sha256-3.crt pkcs7-rsa-sha256-3.key > pkcs7-rsa-sha256-3.pem
 all_final += pkcs7-rsa-sha256-3.crt