diff --git a/libusb/os/darwin_usb.c b/libusb/os/darwin_usb.c
index 485eb43..a2da0cf 100644
--- a/libusb/os/darwin_usb.c
+++ b/libusb/os/darwin_usb.c
@@ -1570,6 +1570,7 @@
   if (cInterface->cfSource) {
     CFRunLoopRemoveSource (libusb_darwin_acfl, cInterface->cfSource, kCFRunLoopDefaultMode);
     CFRelease (cInterface->cfSource);
+    cInterface->cfSource = NULL;
   }
 
   kresult = (*(cInterface->interface))->USBInterfaceClose(cInterface->interface);
diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index 7bbbe39..b82862d 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11662
+#define LIBUSB_NANO 11663