diff --git a/src/Ipc/Runner/RunnerAbstract.php b/src/Ipc/Runner/RunnerAbstract.php
index b716f5b20..2ce33d98c 100644
--- a/src/Ipc/Runner/RunnerAbstract.php
+++ b/src/Ipc/Runner/RunnerAbstract.php
@@ -28,13 +28,13 @@ abstract class RunnerAbstract
          * If using madeline.php, simply return madeline.php path.
          */
         if (\defined('MADELINE_PHP')) {
-            return MADELINE_PHP;
+            return \MADELINE_PHP;
         }
         /**
          * If using madeline.phar, simply return madeline.phar path.
          */
         if (\defined('MADELINE_PHAR')) {
-            return MADELINE_PHAR;
+            return \MADELINE_PHAR;
         }
         // Write process runner to external file if inside a PHAR different from madeline.phar,
         // because PHP can't open files inside a PHAR directly except for the stub.