diff --git a/src/lib-config/write.c b/src/lib-config/write.c
index 5dbbd1ed..b7c6edb5 100644
--- a/src/lib-config/write.c
+++ b/src/lib-config/write.c
@@ -305,6 +305,9 @@ int config_write(CONFIG_REC *rec, const char *fname, int create_mode)
 	const char *base_name;
 	char *tmp_name = NULL;
 	char *dest_name = NULL;
+#if !defined(_POSIX_VERSION) || _POSIX_VERSION < 200809L
+	char resolved_path[PATH_MAX] = { 0 };
+#endif
 
 	g_return_val_if_fail(rec != NULL, -1);
         g_return_val_if_fail(fname != NULL || rec->fname != NULL, -1);
@@ -313,16 +316,15 @@ int config_write(CONFIG_REC *rec, const char *fname, int create_mode)
 	base_name = fname != NULL ? fname : rec->fname;
 
 	/* expand all symlinks; else we may replace a symlink with a regular file */
-	dest_name = realpath(base_name, NULL);
-
-	if (errno == EINVAL) {
-		/* variable path length not supported by glibc < 2.3, Solaris < 11 */
-		char resolved_path[PATH_MAX] = { 0 };
-		errno = 0;
-		if ((dest_name = realpath(base_name, resolved_path)) != NULL) {
-			dest_name = g_strdup(dest_name);
-		}
+#if !defined(_POSIX_VERSION) || _POSIX_VERSION < 200809L
+	/* variable path length not supported by glibc < 2.3, Solaris < 11 */
+	errno = 0;
+	if ((dest_name = realpath(base_name, resolved_path)) != NULL) {
+		dest_name = g_strdup(dest_name);
 	}
+#else
+	dest_name = realpath(base_name, NULL);
+#endif
 
 	if (dest_name == NULL) {
 		if (errno == ENOENT) {