diff --git a/openbsd-compat/getcwd.c b/openbsd-compat/getcwd.c
index 2d56bae19..a904291a2 100644
--- a/openbsd-compat/getcwd.c
+++ b/openbsd-compat/getcwd.c
@@ -70,9 +70,12 @@ getcwd(char *pt, size_t size)
 	 */
 	if (pt) {
 		ptsize = 0;
-		if (!size) {
+		if (size == 0) {
 			errno = EINVAL;
 			return (NULL);
+		} else if (size == 1) {
+			errno = ERANGE;
+			return (NULL);
 		}
 		ept = pt + size;
 	} else {