diff --git a/NEWS b/NEWS
index d468ec1b74a..c7bd9e834d1 100644
--- a/NEWS
+++ b/NEWS
@@ -12,6 +12,9 @@ PHP                                                                        NEWS
   . Fixed bug GH-18581 (Coerce numeric string keys from iterators when argument
     unpacking). (ilutov)
 
+- FTP:
+  . Fix theoretical issues with hrtime() not being available. (nielsdos)
+
 - Hash:
   . Fix crash on clone failure. (nielsdos)
 
@@ -41,6 +44,7 @@ PHP                                                                        NEWS
 - Standard:
   . Fixed OSS Fuzz #433303828 (Leak in failed unserialize() with opcache).
     (ilutov)
+  . Fix theoretical issues with hrtime() not being available. (nielsdos)
 
 31 Jul 2025, PHP 8.4.11
 
diff --git a/ext/ftp/ftp.c b/ext/ftp/ftp.c
index 3dc401a4bff..55a4b951854 100644
--- a/ext/ftp/ftp.c
+++ b/ext/ftp/ftp.c
@@ -1491,7 +1491,8 @@ 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 6af8bfc9650..831e903e1cc 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 {