Index: ram/etavgr.c
===================================================================
--- ram/etavgr.c	(revision a8c6a0ede616187512b11f5f0ace304da10aab8b)
+++ ram/etavgr.c	(revision 9b98b6adc329abbb9cb5ba78d4316ff2fb2ee3e8)
@@ -116,5 +116,5 @@
 	col = stccol - cfetp->flcol;
 
-	ebuf[col] = k + '0';
+	ebuf[col] = (int8_t)(k + '0');
 	ebuf[2] = '\0';
 
@@ -125,5 +125,5 @@
 #endif
 
-	dspbuf[0] = k + '0';
+	dspbuf[0] = (int8_t)(k + '0');
 	dspbuf[1] = '\0';