diff --git a/library/Icinga/Authentication/User/UserBackend.php b/library/Icinga/Authentication/User/UserBackend.php
index 13e688795..826c56e7d 100644
--- a/library/Icinga/Authentication/User/UserBackend.php
+++ b/library/Icinga/Authentication/User/UserBackend.php
@@ -224,7 +224,7 @@ class UserBackend implements ConfigAwareFactory
         }
 
         $resourceConfig = ResourceFactory::getResourceConfig($backendConfig->resource);
-        if ($backendType === 'db') {
+        if ($backendType === 'db' && $resourceConfig->db === 'mysql') {
             $resourceConfig->charset = 'utf8';
         }
 
diff --git a/library/Icinga/Authentication/UserGroup/UserGroupBackend.php b/library/Icinga/Authentication/UserGroup/UserGroupBackend.php
index 2a5948823..e73908739 100644
--- a/library/Icinga/Authentication/UserGroup/UserGroupBackend.php
+++ b/library/Icinga/Authentication/UserGroup/UserGroupBackend.php
@@ -166,7 +166,7 @@ class UserGroupBackend
         }
 
         $resourceConfig = ResourceFactory::getResourceConfig($backendConfig->resource);
-        if ($backendType === 'db') {
+        if ($backendType === 'db' && $resourceConfig->db === 'mysql') {
             $resourceConfig->charset = 'utf8';
         }
 
diff --git a/library/Icinga/Common/Database.php b/library/Icinga/Common/Database.php
index fbe1e0260..4c977653c 100644
--- a/library/Icinga/Common/Database.php
+++ b/library/Icinga/Common/Database.php
@@ -31,7 +31,9 @@ trait Database
         $config = new SqlConfig(ResourceFactory::getResourceConfig(
             IcingaConfig::app()->get('global', 'config_resource')
         ));
-        $config->charset = 'utf8mb4';
+        if ($config->db === 'mysql') {
+            $config->charset = 'utf8mb4';
+        }
 
         $config->options = [PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ];
         if ($config->db === 'mysql') {
diff --git a/library/Icinga/User/Preferences/PreferencesStore.php b/library/Icinga/User/Preferences/PreferencesStore.php
index b6d63a9ad..a084314e4 100644
--- a/library/Icinga/User/Preferences/PreferencesStore.php
+++ b/library/Icinga/User/Preferences/PreferencesStore.php
@@ -131,7 +131,9 @@ abstract class PreferencesStore
             $config->location = Config::resolvePath('preferences');
         } elseif ($type === 'Db') {
             $resourceConfig = ResourceFactory::getResourceConfig($config->resource);
-            $resourceConfig->charset = 'utf8';
+            if ($resourceConfig->db === 'mysql') {
+                $resourceConfig->charset = 'utf8';
+            }
 
             $config->connection = ResourceFactory::createResource($resourceConfig);
         }
diff --git a/modules/migrate/application/clicommands/PreferencesCommand.php b/modules/migrate/application/clicommands/PreferencesCommand.php
index 63f4894be..a8bfc76be 100644
--- a/modules/migrate/application/clicommands/PreferencesCommand.php
+++ b/modules/migrate/application/clicommands/PreferencesCommand.php
@@ -37,7 +37,10 @@ class PreferencesCommand extends Command
         }
 
         $resourceConfig = ResourceFactory::getResourceConfig($resource);
-        $resourceConfig->charset = 'utf8';
+        if ($resourceConfig->db === 'mysql') {
+            $resourceConfig->charset = 'utf8';
+        }
+
         $connection = ResourceFactory::createResource($resourceConfig);
 
         $preferencesPath = Config::resolvePath('preferences');
diff --git a/modules/migrate/library/Migrate/Config/UserDomainMigration.php b/modules/migrate/library/Migrate/Config/UserDomainMigration.php
index 5edc93722..480f74648 100644
--- a/modules/migrate/library/Migrate/Config/UserDomainMigration.php
+++ b/modules/migrate/library/Migrate/Config/UserDomainMigration.php
@@ -207,7 +207,9 @@ class UserDomainMigration
                 break;
             case 'db':
                 $resourceConfig = ResourceFactory::getResourceConfig($config->get('global', 'config_resource'));
-                $resourceConfig->charset = 'utf8';
+                if ($resourceConfig->db === 'mysql') {
+                    $resourceConfig->charset = 'utf8';
+                }
 
                 /** @var DbConnection $conn */
                 $conn = ResourceFactory::createResource($resourceConfig);
@@ -292,7 +294,9 @@ class UserDomainMigration
             }
 
             $resourceConfig = ResourceFactory::getResourceConfig($config->resource);
-            $resourceConfig->charset = 'utf8';
+            if ($resourceConfig->db === 'mysql') {
+                $resourceConfig->charset = 'utf8';
+            }
 
             /** @var DbConnection $conn */
             $conn = ResourceFactory::createResource($resourceConfig);
@@ -343,7 +347,9 @@ class UserDomainMigration
             }
 
             $resourceConfig = ResourceFactory::getResourceConfig($config->resource);
-            $resourceConfig->charset = 'utf8';
+            if ($resourceConfig->db === 'mysql') {
+                $resourceConfig->charset = 'utf8';
+            }
 
             /** @var DbConnection $conn */
             $conn = ResourceFactory::createResource($resourceConfig);