Index: ram/etwoff.c
===================================================================
--- ram/etwoff.c	(revision 31e3c812336945f01a205b116e5dcd665c8d4710)
+++ ram/etwoff.c	(revision 6ab7550dbf580792e2f932155209263649d6f250)
@@ -155,8 +155,8 @@
 	} else {
 
-		ebuf[ec] = k + '0';
+		ebuf[ec] = (int8_t)(k + '0');
 		ebuf[5] = '\0';
 
-		dspbuf[0] = k + '0';
+		dspbuf[0] = (int8_t)(k + '0');
 		dspbuf[1] = '\0';
 	}