diff --git a/src/devede/ffprobe.py b/src/devede/ffprobe.py
index d3ddcc2..4b7ec9d 100644
--- a/src/devede/ffprobe.py
+++ b/src/devede/ffprobe.py
@@ -92,7 +92,7 @@ class ffprobe(devede.executor.executor):
 
         self.original_file_size = os.path.getsize(file_name)
 
-        command_line = ["ffprobe",file_name,"-print_format","json","-show_streams", "-loglevel", "quiet"]
+        command_line = ["ffprobe",file_name,"-of","json","-show_streams", "-loglevel", "quiet"]
 
         (stdout, stderr) = self.launch_process(command_line, False)
         try: