Index: ram/etwpnt.c
===================================================================
--- ram/etwpnt.c	(revision c0cb375b582ef6d0ffc062aed4eadb961de7d1f9)
+++ ram/etwpnt.c	(revision 31e3c812336945f01a205b116e5dcd665c8d4710)
@@ -85,8 +85,8 @@
 	n = nn & 0xFF;
 	ec = stccol - cfetp->flcol;	/* setup edit buffer column */
-	ebuf[ec] = k + '0';
+	ebuf[ec] = (int8_t)(k + '0');
 	ebuf[3] = '\0';
 
-	dspbuf[0] = k + '0';
+	dspbuf[0] = (int8_t)(k + '0');
 	dspbuf[1] = '\0';