--- libusb10_io.c	
+++ libusb10_io.c	
@@ -583,7 +577,8 @@ 
 	libusb_context *ctx;
 	int ret;
 
-	ctx = GET_CONTEXT(NULL);
+	ctx = libusb_get_device(devh)->ctx;
+	ctx = GET_CONTEXT(ctx);
 	DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_bulk_transfer enter");
 
 	ret = libusb10_do_transfer(devh, endpoint, data, length, transferred,
@@ -601,7 +596,8 @@ 
 	libusb_context *ctx;
 	int ret;
 
-	ctx = GET_CONTEXT(NULL);
+	ctx = libusb_get_device(devh)->ctx;
+	ctx = GET_CONTEXT(ctx);
 	DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_interrupt_transfer enter");
 
 	ret = libusb10_do_transfer(devh, endpoint, data, length, transferred,