diff --git a/eval.c b/eval.c
index cf313b4..112c230 100644
--- a/eval.c
+++ b/eval.c
@@ -516,7 +516,7 @@ static char *gtfun( char *fname) {
 		retstr = ltos( atoi( argx) == 42) ;
 		break ;
 	case UFASCII:
-		retstr = i_to_a( (int) argx[ 0]) ;
+		retstr = i_to_a( (int) argx[ 0] & 0xFF) ;
 		break ;
 	case UFCHR:
 		result[0] = atoi(argx);
diff --git a/line.c b/line.c
index c4ec6d6..9c4afb7 100644
--- a/line.c
+++ b/line.c
@@ -265,7 +265,7 @@ int linstr( char *instr) {
 
 		while( (tmpc = *instr++)) {
 			status =
-			    (tmpc == '\n' ? lnewline() : linsert( 1, tmpc)) ;
+			    (tmpc == '\n' ? lnewline() : linsert( 1, tmpc & 0xFF)) ;
 
 			/* Insertion error? */
 			if( status != TRUE) {