diff --git a/test/smime/README b/test/smime/README
index 46211922..6f276398 100644
--- a/test/smime/README
+++ b/test/smime/README
@@ -5,3 +5,5 @@ key+cert.pem: cert + unencryped private
     % gpgsm --import test.crt
     % gpgsm --export-private-key-p12 -out foo.p12  (no passphrase)
     % openssl pkcs12 -in ns.p12 -clcerts -nodes > key+cert.pem
+
+ca.crt: from https://tools.ietf.org/id/draft-dkg-lamps-samples-01.html#name-certificate-authority-certi
diff --git a/test/smime/ca.crt b/test/smime/ca.crt
new file mode 100644
index 00000000..b33d087f
--- /dev/null
+++ b/test/smime/ca.crt
@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/test/test-lib.sh b/test/test-lib.sh
index d4fcea5a..1ffedb25 100644
--- a/test/test-lib.sh
+++ b/test/test-lib.sh
@@ -139,6 +139,8 @@ add_gpgsm_home ()
     gpgsm --batch --no-tty --no-common-certs-import --disable-dirmngr --import < $NOTMUCH_SRCDIR/test/smime/test.crt >"$GNUPGHOME"/import.log 2>&1
     fpr=$(gpgsm --batch --list-key test_suite@notmuchmail.org | sed -n 's/.*fingerprint: //p')
     echo "$fpr S relax" >> $GNUPGHOME/trustlist.txt
+    gpgsm --quiet --batch --no-tty --no-common-certs-import --disable-dirmngr --import < $NOTMUCH_SRCDIR/test/smime/ca.crt
+    echo "4D:E0:FF:63:C0:E9:EC:01:29:11:C8:7A:EE:DA:3A:9A:7F:6E:C1:0D S" >> "$GNUPGHOME/trustlist.txt"
     test_debug "cat $GNUPGHOME/import.log"
 }