diff --git a/osdep-cygwin.c b/osdep-cygwin.c
index 01d2d0c2..f28df376 100644
--- a/osdep-cygwin.c
+++ b/osdep-cygwin.c
@@ -50,7 +50,7 @@ osdep_get_name(int fd, unused char *tty)
 	while ((ch = fgetc(f)) != EOF) {
 		if (ch == '\0')
 			break;
-		buf = xrealloc(buf, 1, len + 2);
+		buf = xrealloc(buf, len + 2);
 		buf[len++] = ch;
 	}
 	if (buf != NULL)
diff --git a/osdep-linux.c b/osdep-linux.c
index 46aea68e..706a273f 100644
--- a/osdep-linux.c
+++ b/osdep-linux.c
@@ -50,7 +50,7 @@ osdep_get_name(int fd, unused char *tty)
 	while ((ch = fgetc(f)) != EOF) {
 		if (ch == '\0')
 			break;
-		buf = xrealloc(buf, 1, len + 2);
+		buf = xrealloc(buf, len + 2);
 		buf[len++] = ch;
 	}
 	if (buf != NULL)