diff --git a/radio/src/dmafifo.h b/radio/src/dmafifo.h
index 837dfd2da..db0d885d5 100644
--- a/radio/src/dmafifo.h
+++ b/radio/src/dmafifo.h
@@ -36,7 +36,7 @@ class DMAFifo
 
     void clear()
     {
-      ridx = N - stream->NDTR;
+      ridx = 0;
     }
 
     uint32_t size()