diff --git a/php/psalm-baseline.xml b/php/psalm-baseline.xml
index ff78305b..662afd35 100644
--- a/php/psalm-baseline.xml
+++ b/php/psalm-baseline.xml
@@ -32,22 +32,6 @@
       <code><![CDATA[file_get_contents(DataConst::GetBackupPublicKey())]]></code>
     </PossiblyFalseArgument>
   </file>
-  <file src="src/Data/DataConst.php">
-    <FalsableReturnStatement>
-      <code><![CDATA[realpath(__DIR__ . '/../cool-seccomp-profile.json')]]></code>
-      <code><![CDATA[realpath(__DIR__ . '/../containers.json')]]></code>
-      <code><![CDATA[realpath(__DIR__ . '/../../../community-containers/')]]></code>
-      <code><![CDATA[realpath(__DIR__ . '/../../data/')]]></code>
-      <code><![CDATA[realpath(__DIR__ . '/../../session/')]]></code>
-    </FalsableReturnStatement>
-    <InvalidFalsableReturnType>
-      <code><![CDATA[string]]></code>
-      <code><![CDATA[string]]></code>
-      <code><![CDATA[string]]></code>
-      <code><![CDATA[string]]></code>
-      <code><![CDATA[string]]></code>
-    </InvalidFalsableReturnType>
-  </file>
   <file src="src/Docker/DockerActionManager.php">
     <PossiblyFalseArgument>
       <code><![CDATA[$line]]></code>
diff --git a/php/src/Data/DataConst.php b/php/src/Data/DataConst.php
index 1db2f6ae..099079c6 100644
--- a/php/src/Data/DataConst.php
+++ b/php/src/Data/DataConst.php
@@ -8,7 +8,7 @@ class DataConst {
             return '/mnt/docker-aio-config/data/';
         }
 
-        return realpath(__DIR__ . '/../../data/');
+        return (string)realpath(__DIR__ . '/../../data/');
     }
 
     public static function GetSessionDirectory() : string {
@@ -16,7 +16,7 @@ class DataConst {
             return '/mnt/docker-aio-config/session/';
         }
 
-        return realpath(__DIR__ . '/../../session/');
+        return (string)realpath(__DIR__ . '/../../session/');
     }
 
     public static function GetConfigFile() : string {
@@ -56,14 +56,14 @@ class DataConst {
     }
 
     public static function GetCommunityContainersDirectory() : string {
-        return realpath(__DIR__ . '/../../../community-containers/');
+        return (string)realpath(__DIR__ . '/../../../community-containers/');
     }
 
     public static function GetCollaboraSeccompProfilePath() : string {
-        return realpath(__DIR__ . '/../cool-seccomp-profile.json');
+        return (string)realpath(__DIR__ . '/../cool-seccomp-profile.json');
     }
 
     public static function GetContainersDefinitionPath() : string {
-        return realpath(__DIR__ . '/../containers.json');
+        return (string)realpath(__DIR__ . '/../containers.json');
     }
 }