diff --git a/v4l2.go b/v4l2.go
index 03083a8..79dc65d 100644
--- a/v4l2.go
+++ b/v4l2.go
@@ -499,7 +499,7 @@ func mmapQueryBuffer(fd uintptr, index uint32, length *uint32) (buffer []byte, e
 
 	*length = req.length
 
-	buffer, err = unix.Mmap(int(fd), int64(offset), int(req.length), unix.PROT_READ, unix.MAP_SHARED)
+	buffer, err = unix.Mmap(int(fd), int64(offset), int(req.length), unix.PROT_READ|unix.PROT_WRITE, unix.MAP_SHARED)
 	return
 }
 
diff --git a/webcam.go b/webcam.go
index 66f236a..bf72815 100644
--- a/webcam.go
+++ b/webcam.go
@@ -35,7 +35,7 @@ type Control struct {
 // Checks if device is a v4l2 device and if it is
 // capable to stream video
 func Open(path string) (*Webcam, error) {
-	handle, err := unix.Open(path, unix.O_RDONLY|unix.O_NONBLOCK, 0666)
+	handle, err := unix.Open(path, unix.O_RDWR|unix.O_NONBLOCK, 0666)
 	if err != nil {
 		return nil, err
 	}