Index: ram/etwslt.c
===================================================================
--- ram/etwslt.c	(revision 8aad29e0c3cb4f9bfbc929318dd9e61996aa3a9c)
+++ ram/etwslt.c	(revision c0cb375b582ef6d0ffc062aed4eadb961de7d1f9)
@@ -89,8 +89,8 @@
 		return(FAILURE);
 
-	ebuf[0] = k + 'A';
+	ebuf[0] = (int8_t)(k + 'A');
 	ebuf[1] = '\0';
 
-	dspbuf[0] = k + 'A';
+	dspbuf[0] = (int8_t)(k + 'A');
 	dspbuf[1] = '\0';