diff --git a/y2020/vision/v4l2_reader.cc b/y2020/vision/v4l2_reader.cc
index 727f8ba..f43a2ac 100644
--- a/y2020/vision/v4l2_reader.cc
+++ b/y2020/vision/v4l2_reader.cc
@@ -15,10 +15,7 @@
   PCHECK(fd_.get() != -1);
 
   // First, clean up after anybody else who left the device streaming.
-  {
-    int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-    PCHECK(Ioctl(VIDIOC_STREAMOFF, &type) == 0);
-  }
+  StreamOff();
 
   {
     struct v4l2_format format;
@@ -130,5 +127,19 @@
   PCHECK(Ioctl(VIDIOC_QBUF, &buffer) == 0);
 }
 
+void V4L2Reader::StreamOff() {
+  int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+  const int result = Ioctl(VIDIOC_STREAMOFF, &type);
+  if (result == 0) {
+    return;
+  }
+  // Some devices (like Alex's webcam) return this if streaming isn't currently
+  // on, unlike what the documentations says should happen.
+  if (errno == EBUSY) {
+    return;
+  }
+  PLOG(FATAL) << "VIDIOC_STREAMOFF failed";
+}
+
 }  // namespace vision
 }  // namespace frc971