diff --git a/src/Services/PdfGenerator.php b/src/Services/PdfGenerator.php
index 7aeea17..5482d97 100644
--- a/src/Services/PdfGenerator.php
+++ b/src/Services/PdfGenerator.php
@@ -92,7 +92,7 @@ class PdfGenerator
         $maxDuration = $this->config['job_max_duration'] ?? 360;
 
         $cmd = 'timeout ' . (int)$maxDuration . ' ';
-        $cmd .= 'TMPDIR=' . escapeshellarg($this->config['tmp_dir']) . ' ';
+        $cmd .= 'env TMPDIR=' . escapeshellarg($this->config['tmp_dir']) . ' ';
         $cmd .= escapeshellcmd($this->config['pagedjs_bin']);
         $cmd .= ' ' . escapeshellarg($url);
         $cmd .= ' -o ' . escapeshellarg($pdfFile);