diff --git a/ext/ftp/ftp.c b/ext/ftp/ftp.c
index f37ee686176..ceb3ee25090 100644
--- a/ext/ftp/ftp.c
+++ b/ext/ftp/ftp.c
@@ -1382,7 +1382,8 @@ static int my_poll(php_socket_t fd, int events, int timeout) {
 
 		if (n == -1 && php_socket_errno() == EINTR) {
 			zend_hrtime_t delta_ns = zend_hrtime() - start_ns;
-			if (delta_ns > timeout_hr) {
+			/* delta_ns == 0 is only possible with a platform that does not support a high-res timer. */
+			if (delta_ns > timeout_hr || UNEXPECTED(delta_ns == 0)) {
 #ifndef PHP_WIN32
 				errno = ETIMEDOUT;
 #endif
diff --git a/ext/standard/hrtime.c b/ext/standard/hrtime.c
index f8d5e317913..10853493b63 100644
--- a/ext/standard/hrtime.c
+++ b/ext/standard/hrtime.c
@@ -46,7 +46,6 @@
 	delivered timestamp is monotonic and cannot be adjusted. */
 PHP_FUNCTION(hrtime)
 {
-#if ZEND_HRTIME_AVAILABLE
 	bool get_as_num = 0;
 	zend_hrtime_t t = zend_hrtime();
 
@@ -55,6 +54,7 @@ PHP_FUNCTION(hrtime)
 		Z_PARAM_BOOL(get_as_num)
 	ZEND_PARSE_PARAMETERS_END();
 
+#if ZEND_HRTIME_AVAILABLE
 	if (UNEXPECTED(get_as_num)) {
 		PHP_RETURN_HRTIME(t);
 	} else {