diff --git a/Zend/zend_portability.h b/Zend/zend_portability.h
index 193a28259f0c..2c70d5159417 100644
--- a/Zend/zend_portability.h
+++ b/Zend/zend_portability.h
@@ -114,6 +114,9 @@ using std::memory_order_acquire;
 
 #if defined(ZEND_WIN32) && !defined(__clang__)
 # define ZEND_ASSUME(c)	__assume(c)
+#elif defined(__GNUC__) && !defined(__clang__) && __GNUC__ >= 14
+/* GCC emits a warning when __attribute__ appears directly after a label, so we need a do-while loop. */
+# define ZEND_ASSUME(c)	do { __attribute__((assume(c))); } while (0)
 #elif defined(__clang__) && __has_builtin(__builtin_assume)
 # pragma clang diagnostic ignored "-Wassume"
 # define ZEND_ASSUME(c)	__builtin_assume(c)