diff --git a/tests/aux/ldap.pl b/tests/aux/ldap.pl
index 55be4d6..6007373 100755
--- a/tests/aux/ldap.pl
+++ b/tests/aux/ldap.pl
@@ -45,6 +45,7 @@ use constant RESULT_OK => {
 my %objects = (
   'base=uid=foo,ou=users,dc=example,dc=com' => {keys => ['vvincredible']},
   'base=uid=test,ou=users,dc=example,dc=com' => {keys => ['cccccccfhcbe', 'ccccccbchvth']},
+  'base=uid=nokeys,ou=users,dc=example,dc=com' => {keys => []},
   'sub:base=:(uid=test)' => {keys => ['cccccccfhcbe', 'ccccccbchvth'], dn => 'uid=test,out=users,dc=example,dc=com'},
 );
 
diff --git a/tests/pam_test.c b/tests/pam_test.c
index 6be0d1f..25c2b2e 100644
--- a/tests/pam_test.c
+++ b/tests/pam_test.c
@@ -66,6 +66,7 @@ static struct data {
   {"test", "ccccccbchvthlivuitriujjifivbvtrjkjfirllluurj"},
   {"foo", ""},
   {"bar", ""},
+  {"nokeys", ""},
 };
 
 
@@ -274,6 +275,10 @@ static int test_authenticate_ldap5(void) {
   return pam_sm_authenticate(6, 0, sizeof(ldap_cfg) / sizeof(char*), ldap_cfg);
 }
 
+static int test_authenticate_ldap6(void) {
+  return pam_sm_authenticate(7, 0, sizeof(ldap_cfg) / sizeof(char*), ldap_cfg);
+}
+
 static pid_t run_mock(const char *port, const char *type) {
   pid_t pid = fork();
   if(pid == 0) {
@@ -354,6 +359,10 @@ int main(void) {
     ret = 1007;
     goto out;
   }
+  if(test_authenticate_ldap6() != PAM_USER_UNKNOWN) {
+    ret = 1008;
+    goto out;
+  }
 #endif
 
 out: