diff --git a/src/peek.c b/src/peek.c
index 67d0a42..a769e90 100644
--- a/src/peek.c
+++ b/src/peek.c
@@ -20,7 +20,7 @@
 #include <stdio.h> /* fprintf(3), fgetc(3), perror(3), fputc(3), stderr, stdin,
                     * stdout, EOF, NULL */
 #include <stdlib.h> /* exit(3), EXIT_FAILURE */
-#if !defined EX_OK || !defined EX_OSERR || !defined EX_USAGE
+#if !defined EX_IOERR || !defined EX_OK || !defined EX_USAGE
 #	include <sysexits.h>
 #endif
 #include <termios.h> /* tcgetattr(3), tcsetattr(3), struct termios, ECHO */
@@ -46,7 +46,6 @@ static void restore_echo(int sig){
 	return;
 }
 
-static int oserr(char *s){ perror(s); return EX_OSERR; }
 static int ioerr(char *s){ perror(s); restore_echo(0); return EX_IOERR; }
 static int usage(char *s){
 	fprintf(stderr, "Usage: %s (-1enot) (-p [program [arguments...]])\n", s);
@@ -58,7 +57,7 @@ int main(int argc, char *argv[]){
 	if(argc < 1)
 		return usage(program_name);
 
-	{ /* options parsing */
+	{ /* option parsing */
 		char allow_nonterminals;
 		int c;
 
@@ -108,8 +107,8 @@ int main(int argc, char *argv[]){
 	{ /* actual input loop */
 		int c;
 
-		while((c = getc(stdin)) != EOF)
-			if(putc(c, stdout) == EOF)
+		while((c = fgetc(stdin)) != EOF)
+			if(fputc(c, stdout) == EOF)
 				return ioerr(argv[0]);
 	}