diff --git a/test/T355-smime.sh b/test/T355-smime.sh
index b813b6ca..1523f17b 100755
--- a/test/T355-smime.sh
+++ b/test/T355-smime.sh
@@ -10,7 +10,7 @@ add_gpgsm_home ()
     _gnupg_exit () { gpgconf --kill all 2>/dev/null || true; }
     at_exit_function _gnupg_exit
     mkdir -m 0700 "$GNUPGHOME"
-    gpgsm --no-tty --no-common-certs-import --disable-dirmngr --import < $TEST_DIRECTORY/smime/test.crt >"$GNUPGHOME"/import.log 2>&1
+    gpgsm --no-tty --no-common-certs-import --disable-dirmngr --import < $NOTMUCH_SRCDIR/test/smime/test.crt >"$GNUPGHOME"/import.log 2>&1
     fpr=$(gpgsm  --list-key test_suite@notmuchmail.org | sed -n 's/.*fingerprint: //p')
     echo "$fpr S relax" >> $GNUPGHOME/trustlist.txt
     test_debug "cat $GNUPGHOME/import.log"
@@ -19,7 +19,7 @@ add_gpgsm_home ()
 test_require_external_prereq openssl
 test_require_external_prereq gpgsm
 
-cp $TEST_DIRECTORY/smime/key+cert.pem test_suite.pem
+cp $NOTMUCH_SRCDIR/test/smime/key+cert.pem test_suite.pem
 
 FINGERPRINT=$(openssl x509 -fingerprint -in test_suite.pem -noout | sed -e 's/^.*=//' -e s/://g)
 
@@ -41,7 +41,7 @@ test_expect_success \
 
 test_begin_subtest "Signature verification (openssl)"
 notmuch show --format=raw subject:"test signed message 001" |\
-    openssl smime -verify -CAfile $TEST_DIRECTORY/smime/test.crt 2>OUTPUT
+    openssl smime -verify -CAfile $NOTMUCH_SRCDIR/test/smime/test.crt 2>OUTPUT
 cat <<EOF > EXPECTED
 Verification successful
 EOF
@@ -86,7 +86,7 @@ test_expect_equal_json \
 test_begin_subtest "Decryption and signature verification (openssl)"
 notmuch show --format=raw subject:"test encrypted message 001" |\
     openssl smime -decrypt -recip test_suite.pem |\
-    openssl smime -verify -CAfile $TEST_DIRECTORY/smime/test.crt 2>OUTPUT
+    openssl smime -verify -CAfile $NOTMUCH_SRCDIR/test/smime/test.crt 2>OUTPUT
 cat <<EOF > EXPECTED
 Verification successful
 EOF