diff --git a/src/lib/common/journal.c b/src/lib/common/journal.c
index 1a9841ba..d21aeb12 100644
--- a/src/lib/common/journal.c
+++ b/src/lib/common/journal.c
@@ -85,7 +85,7 @@ journal_entry(char *fmt, ...)
 	va_end(ap);
 
 	for (i = n; buf[i]; ++i) {
-	    if (!isprint(buf[i]))
+	    if (!isprint((unsigned char)buf[i]))
 		buf[i] = '?';	/* FIXME replace by escape */
 	}
 	buf[i++] = '\n';
diff --git a/src/lib/gen/parse.c b/src/lib/gen/parse.c
index f8536429..778f2c49 100644
--- a/src/lib/gen/parse.c
+++ b/src/lib/gen/parse.c
@@ -64,7 +64,7 @@ parse(char *buf, char **arg, char **condp, char *space, char **redir)
     if (condp != NULL)
 	*condp = NULL;
     for (argnum = 0; *buf && argnum < 127;) {
-	while (isspace(*buf))
+	while (isspace((unsigned char)*buf))
 	    buf++;
 	if (!*buf)
 	    break;
@@ -74,7 +74,7 @@ parse(char *buf, char **arg, char **condp, char *space, char **redir)
 	}
 	quoted = 0;
 	for (bp2 = bp1; *buf;) {
-	    if (!quoted && isspace(*buf)) {
+	    if (!quoted && isspace((unsigned char)*buf)) {
 		buf++;
 		break;
 	    }