diff --git a/undercover/pdf_builder.py b/undercover/pdf_builder.py
index 3f9dce2..bac4120 100644
--- a/undercover/pdf_builder.py
+++ b/undercover/pdf_builder.py
@@ -76,13 +76,13 @@ class CLData:
 
             result = subprocess.run(
                 [
-                    'gs'
-                    '-sDEVICE=pdfwrite'
-                    '-dCompatibilityLevel=1.5'
-                    '-dNOPAUSE'
-                    '-dQUIET'
-                    '-dBATCH'
-                    '-dPrinted=false'
+                    'gs',
+                    '-sDEVICE=pdfwrite',
+                    '-dCompatibilityLevel=1.5',
+                    '-dNOPAUSE',
+                    '-dQUIET',
+                    '-dBATCH',
+                    '-dPrinted=false',
                     '-sOutputFile=outputs/' + unique_id + '.compressed.pdf',
                     'outputs/' + unique_id + '.pdf'
                 ],