diff --git a/src/Controller/Adminhtml/Config/Index.php b/src/Controller/Adminhtml/Config/Index.php
index 77e26df..4713f9d 100644
--- a/src/Controller/Adminhtml/Config/Index.php
+++ b/src/Controller/Adminhtml/Config/Index.php
@@ -17,7 +17,7 @@ class Index extends Action
      *
      * @see _isAllowed()
      */
-    const ADMIN_RESOURCE = 'Jh_Import::config';
+    public const ADMIN_RESOURCE = 'Jh_Import::config';
 
     /**
      * @var PageFactory
diff --git a/src/Controller/Adminhtml/Config/Info.php b/src/Controller/Adminhtml/Config/Info.php
index 429048d..95ae7ca 100644
--- a/src/Controller/Adminhtml/Config/Info.php
+++ b/src/Controller/Adminhtml/Config/Info.php
@@ -20,7 +20,7 @@ class Info extends Action
      *
      * @see _isAllowed()
      */
-    const ADMIN_RESOURCE = 'Jh_Import::config';
+    public const ADMIN_RESOURCE = 'Jh_Import::config';
 
     /**
      * @var PageFactory
diff --git a/src/Controller/Adminhtml/Files/Delete.php b/src/Controller/Adminhtml/Files/Delete.php
index 3a89149..01a8dd1 100644
--- a/src/Controller/Adminhtml/Files/Delete.php
+++ b/src/Controller/Adminhtml/Files/Delete.php
@@ -19,7 +19,7 @@ class Delete extends Action
      *
      * @see _isAllowed()
      */
-    const ADMIN_RESOURCE = 'Jh_Import::files';
+    public const ADMIN_RESOURCE = 'Jh_Import::files';
 
     /**
      * @var DirectoryList
diff --git a/src/Controller/Adminhtml/Files/Download.php b/src/Controller/Adminhtml/Files/Download.php
index a5ef8b0..1ee8f5e 100644
--- a/src/Controller/Adminhtml/Files/Download.php
+++ b/src/Controller/Adminhtml/Files/Download.php
@@ -21,7 +21,7 @@ class Download extends Action
      *
      * @see _isAllowed()
      */
-    const ADMIN_RESOURCE = 'Jh_Import::files';
+    public const ADMIN_RESOURCE = 'Jh_Import::files';
 
     /**
      * @var FileFactory
diff --git a/src/Controller/Adminhtml/Log/Import.php b/src/Controller/Adminhtml/Log/Import.php
index 6726aa2..f62d4d8 100644
--- a/src/Controller/Adminhtml/Log/Import.php
+++ b/src/Controller/Adminhtml/Log/Import.php
@@ -18,7 +18,7 @@ class Import extends Action
      *
      * @see _isAllowed()
      */
-    const ADMIN_RESOURCE = 'Jh_Import::logs';
+    public const ADMIN_RESOURCE = 'Jh_Import::logs';
 
     /**
      * @var PageFactory
diff --git a/src/Controller/Adminhtml/Log/Index.php b/src/Controller/Adminhtml/Log/Index.php
index bd47727..bd0924d 100644
--- a/src/Controller/Adminhtml/Log/Index.php
+++ b/src/Controller/Adminhtml/Log/Index.php
@@ -19,7 +19,7 @@ class Index extends Action
      *
      * @see _isAllowed()
      */
-    const ADMIN_RESOURCE = 'Jh_Import::logs';
+    public const ADMIN_RESOURCE = 'Jh_Import::logs';
 
     /**
      * @var PageFactory
diff --git a/src/LogLevel.php b/src/LogLevel.php
index caa6cd2..92168eb 100644
--- a/src/LogLevel.php
+++ b/src/LogLevel.php
@@ -7,14 +7,14 @@
  */
 class LogLevel
 {
-    const DEBUG = 'DEBUG';
-    const INFO = 'INFO';
-    const NOTICE = 'NOTICE';
-    const WARNING = 'WARNING';
-    const ERROR = 'ERROR';
-    const CRITICAL = 'CRITICAL';
-    const ALERT = 'ALERT';
-    const EMERGENCY = 'EMERGENCY';
+    public const DEBUG = 'DEBUG';
+    public const INFO = 'INFO';
+    public const NOTICE = 'NOTICE';
+    public const WARNING = 'WARNING';
+    public const ERROR = 'ERROR';
+    public const CRITICAL = 'CRITICAL';
+    public const ALERT = 'ALERT';
+    public const EMERGENCY = 'EMERGENCY';
 
     /**
      * @var array $levels Logging levels