diff --git a/EKF/RingBuffer.h b/EKF/RingBuffer.h
index 446151764b..5e7af56d83 100644
--- a/EKF/RingBuffer.h
+++ b/EKF/RingBuffer.h
@@ -71,6 +71,7 @@ public:
 		}
 
 		_size = size;
+		memset(_buffer,0,sizeof(data_type)*_size);
 		_first_write = true;
 		return true;
 	}