diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index c0556a6..495dc02 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -1410,6 +1410,17 @@
 				-extfile server5.crt.openssl.v3_ext -set_serial 10 -days 3650 -sha256 -in $< -out $@
 all_final += server6.crt
 
+server6-ss-child.csr : server6.key
+	$(OPENSSL) req -new -subj "/CN=selfsigned-child/OU=testing/O=PolarSSL/C=NL" \
+		-key $< -out $@
+all_intermediate += server6-ss-child.csr
+server6-ss-child.crt: server6-ss-child.csr server5-selfsigned.crt server5.key server6-ss-child.crt.openssl.v3_ext
+	$(OPENSSL) x509 -req -CA server5-selfsigned.crt -CAkey server5.key \
+				-extfile server6-ss-child.crt.openssl.v3_ext \
+				-set_serial 0x53a2cb5822399474a7ec79ec \
+				-days 3650 -sha256 -in $< -out $@
+all_final += server6-ss-child.crt
+
 ################################################################
 ### Generate certificates for CRT write check tests
 ################################################################
diff --git a/tests/data_files/server6-ss-child.crt b/tests/data_files/server6-ss-child.crt
index 3c6fd4d..fc28f34 100644
--- a/tests/data_files/server6-ss-child.crt
+++ b/tests/data_files/server6-ss-child.crt
@@ -1,13 +1,13 @@
 -----BEGIN CERTIFICATE-----
-MIIB8jCCAZmgAwIBAgIMU6LLWCI5lHSn7HnsMAoGCCqGSM49BAMCMEcxEzARBgNV
-BAMTCnNlbGZzaWduZWQxEDAOBgNVBAsTB3Rlc3RpbmcxETAPBgNVBAoTCFBvbGFy
-U1NMMQswCQYDVQQGEwJOTDAiGA8yMDE0MDYxOTExMzY1NloYDzIwMjQwNjE4MTEz
-NjU2WjBNMRkwFwYDVQQDExBzZWxmc2lnbmVkLWNoaWxkMRAwDgYDVQQLEwd0ZXN0
-aW5nMREwDwYDVQQKEwhQb2xhclNTTDELMAkGA1UEBhMCTkwwWTATBgcqhkjOPQIB
-BggqhkjOPQMBBwNCAASBWTF2SST6Fa2roDFuDu0zEfqRJVXBsMGcA3I+mLotpHI3
-iR9DN40fjjrY8FfoL0/JAKT323MPssYElNFAOzjjo2EwXzAMBgNVHRMBAf8EAjAA
-MA8GA1UdDwEB/wQFAwMHgAAwHQYDVR0OBBYEFDxZrEo+LvwCNi/afcvLnHqyiZlT
-MB8GA1UdIwQYMBaAFLZtURgXjmWq8uzV8wHkbFLCNB1bMAoGCCqGSM49BAMCA0cA
-MEQCIAMlQ59/NW7S0hP1cu5OTD2zqT087bEmnIfOTBYfj8UFAiBBrrz2dipODVYx
-vvTsQmSCzjrm+JtQQoWa+cdnAG3w5g==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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server6-ss-child.crt.openssl.v3_ext b/tests/data_files/server6-ss-child.crt.openssl.v3_ext
new file mode 100644
index 0000000..dd9cdaa
--- /dev/null
+++ b/tests/data_files/server6-ss-child.crt.openssl.v3_ext
@@ -0,0 +1,4 @@
+basicConstraints = critical,CA:false
+keyUsage=critical,digitalSignature
+subjectKeyIdentifier=hash
+