diff --git a/c_src/procket_cmd.c b/c_src/procket_cmd.c
index 3887d39..bcf73a3 100644
--- a/c_src/procket_cmd.c
+++ b/c_src/procket_cmd.c
@@ -268,7 +268,7 @@ procket_open_char_dev(char *dev)
     struct stat buf = {0};
     int err = 0;
 
-    if ( (fd = open(dev, O_RDWR)) < 0)
+    if ( (fd = open(dev, O_RDWR|O_NONBLOCK)) < 0)
         return -1;
 
     /* Test the file is a character device */