Index: ram/etwhar.c
===================================================================
--- ram/etwhar.c	(revision 6ab7550dbf580792e2f932155209263649d6f250)
+++ ram/etwhar.c	(revision d235320034dd5cb2eba11be522aa05c15bac38d2)
@@ -84,8 +84,8 @@
 	n = nn & 0xFF;
 	ec = stccol - cfetp->flcol;	/* setup edit buffer column */
-	ebuf[ec] = k + '0';
+	ebuf[ec] = (int8_t)(k + '0');
 	ebuf[2] = '\0';
 
-	dspbuf[0] = k + '0';
+	dspbuf[0] = (int8_t)(k + '0');
 	dspbuf[1] = '\0';