diff --git a/E3S1PROFORKBYTT_printdata_prusaslicer_v27_thumbnail.py b/E3S1PROFORKBYTT_printdata_prusaslicer_v27_thumbnail.py
index a34c95f..d7ff449 100644
--- a/E3S1PROFORKBYTT_printdata_prusaslicer_v27_thumbnail.py
+++ b/E3S1PROFORKBYTT_printdata_prusaslicer_v27_thumbnail.py
@@ -148,5 +148,7 @@ if __name__ == "__main__":
     if len(sys.argv) < 2:
         print("Usage: python3 script.py <gcode-file>")
         sys.exit(1)
-
-    main(sys.argv[1])
+    if platform.system() == "Darwin":
+        main(source_file)
+    else:
+        main(sys.argv[1])