diff --git a/test/T050-new.sh b/test/T050-new.sh
index 93a6fa94..f38e6263 100755
--- a/test/T050-new.sh
+++ b/test/T050-new.sh
@@ -284,9 +284,9 @@ notmuch config set new.tags $OLDCONFIG
 
 
 test_begin_subtest "Xapian exception: read only files"
-chmod u-w  ${MAIL_DIR}/.notmuch/xapian/*.DB
+chmod u-w  ${MAIL_DIR}/.notmuch/xapian/*.${db_ending}
 output=$(NOTMUCH_NEW --debug 2>&1 | sed 's/: .*$//' )
-chmod u+w  ${MAIL_DIR}/.notmuch/xapian/*.DB
+chmod u+w  ${MAIL_DIR}/.notmuch/xapian/*.${db_ending}
 test_expect_equal "$output" "A Xapian exception occurred opening database"
 
 test_done
diff --git a/test/T060-count.sh b/test/T060-count.sh
index 3fec94e8..0ac83140 100755
--- a/test/T060-count.sh
+++ b/test/T060-count.sh
@@ -95,7 +95,7 @@ test_expect_equal_file EXPECTED OUTPUT
 
 backup_database
 test_begin_subtest "error message for database open"
-dd if=/dev/zero of="${MAIL_DIR}/.notmuch/xapian/postlist.DB" count=3
+dd if=/dev/zero of="${MAIL_DIR}/.notmuch/xapian/postlist.${db_ending}" count=3
 notmuch count '*' 2>OUTPUT 1>/dev/null
 output=$(sed 's/^\(A Xapian exception [^:]*\):.*$/\1/' OUTPUT)
 test_expect_equal "${output}" "A Xapian exception occurred opening database"
@@ -105,7 +105,7 @@ cat <<EOF > count-files.gdb
 set breakpoint pending on
 break count_files
 commands
-shell cp /dev/null ${MAIL_DIR}/.notmuch/xapian/postlist.DB
+shell cp /dev/null ${MAIL_DIR}/.notmuch/xapian/postlist.${db_ending}
 continue
 end
 run
diff --git a/test/T150-tagging.sh b/test/T150-tagging.sh
index 8adcabce..a451ffae 100755
--- a/test/T150-tagging.sh
+++ b/test/T150-tagging.sh
@@ -287,9 +287,9 @@ test_expect_code 1 "Empty tag names" 'notmuch tag + One'
 test_expect_code 1 "Tag name beginning with -" 'notmuch tag +- One'
 
 test_begin_subtest "Xapian exception: read only files"
-chmod u-w  ${MAIL_DIR}/.notmuch/xapian/*.DB
+chmod u-w  ${MAIL_DIR}/.notmuch/xapian/*.${db_ending}
 output=$(notmuch tag +something '*' 2>&1 | sed 's/: .*$//' )
-chmod u+w  ${MAIL_DIR}/.notmuch/xapian/*.DB
+chmod u+w  ${MAIL_DIR}/.notmuch/xapian/*.${db_ending}
 test_expect_equal "$output" "A Xapian exception occurred opening database"
 
 test_done
diff --git a/test/T360-symbol-hiding.sh b/test/T360-symbol-hiding.sh
index 89e7f165..3f18ec1a 100755
--- a/test/T360-symbol-hiding.sh
+++ b/test/T360-symbol-hiding.sh
@@ -15,11 +15,11 @@ test_begin_subtest 'running test' run_test
 mkdir -p ${PWD}/fakedb/.notmuch
 ( LD_LIBRARY_PATH="$TEST_DIRECTORY/../lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}" \
 		 $TEST_DIRECTORY/symbol-test ${PWD}/fakedb ${PWD}/nonexistent \
-		 2>&1 | notmuch_dir_sanitize | sed "s,\`,\',g") > OUTPUT
+		 2>&1 | notmuch_dir_sanitize | sed -e "s,\`,\',g" -e "s,${NOTMUCH_DEFAULT_XAPIAN_BACKEND},backend,g") > OUTPUT
 
 cat <<EOF > EXPECTED
 A Xapian exception occurred opening database: Couldn't stat 'CWD/fakedb/.notmuch/xapian'
-caught No chert database found at path 'CWD/nonexistent'
+caught No backend database found at path 'CWD/nonexistent'
 EOF
 test_expect_equal_file EXPECTED OUTPUT
 
diff --git a/test/T560-lib-error.sh b/test/T560-lib-error.sh
index 49d36740..087c6bd7 100755
--- a/test/T560-lib-error.sh
+++ b/test/T560-lib-error.sh
@@ -189,7 +189,7 @@ Path already exists: MAIL_DIR
 EOF
 test_expect_equal_file EXPECTED OUTPUT
 
-cat <<'EOF' > c_head
+cat <<EOF > c_head
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -210,7 +210,7 @@ int main (int argc, char** argv)
      fprintf (stderr, "error opening database: %d %s\n", stat, msg ? msg : "");
      exit (1);
    }
-   path = talloc_asprintf (db, "%s/.notmuch/xapian/postlist.DB", argv[1]);
+   path = talloc_asprintf (db, "%s/.notmuch/xapian/postlist.${db_ending}", argv[1]);
    fd = open(path,O_WRONLY|O_TRUNC);
    if (fd < 0) {
        fprintf (stderr, "error opening %s\n", argv[1]);