diff --git a/src/hw_frog.c b/src/hw_frog.c
index e2bec3b..7953b18 100644
--- a/src/hw_frog.c
+++ b/src/hw_frog.c
@@ -182,7 +182,7 @@ hw_frog_transfer (hw_frog_device_t *device,
 		// Read the ready byte.
 		unsigned char answer[1] = {0};
 		status = dc_iostream_read (device->iostream, answer, sizeof (answer), NULL);
-		if (status != sizeof (answer)) {
+		if (status != DC_STATUS_SUCCESS) {
 			ERROR (abstract->context, "Failed to receive the ready byte.");
 			return status;
 		}