diff --git a/NEWS b/NEWS
index 510537e6a86..2d6670b9631 100644
--- a/NEWS
+++ b/NEWS
@@ -6,6 +6,8 @@ PHP                                                                        NEWS
   . Fixed bug GH-16054 (Segmentation fault when resizing hash table iterator
     list while adding). (nielsdos)
   . Fixed bug GH-15905 (Assertion failure for TRACK_VARS_SERVER). (cmb)
+  . Fixed bug GH-15907 (Failed assertion when promoting Serialize deprecation to
+    exception). (ilutov)
 
 - DOM:
   . Fixed bug GH-16039 (Segmentation fault (access null pointer) in
diff --git a/Zend/tests/gh15907.phpt b/Zend/tests/gh15907.phpt
new file mode 100644
index 00000000000..8d6dada36ad
--- /dev/null
+++ b/Zend/tests/gh15907.phpt
@@ -0,0 +1,18 @@
+--TEST--
+GH-15907: Failed assertion when promoting inheritance error to exception
+--FILE--
+<?php
+
+set_error_handler(function($errno, $msg) {
+    throw new Exception($msg);
+});
+
+class C implements Serializable {
+    public function serialize() {}
+    public function unserialize($serialized) {}
+}
+
+?>
+--EXPECTF--
+Fatal error: During inheritance of C, while implementing Serializable: Uncaught Exception: C implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in %s:%d
+%a
diff --git a/Zend/zend_interfaces.c b/Zend/zend_interfaces.c
index caa96f9cf5e..13cf6966055 100644
--- a/Zend/zend_interfaces.c
+++ b/Zend/zend_interfaces.c
@@ -474,6 +474,10 @@ static int zend_implement_serializable(zend_class_entry *interface, zend_class_e
 	if (!(class_type->ce_flags & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS)
 			&& (!class_type->__serialize || !class_type->__unserialize)) {
 		zend_error(E_DEPRECATED, "%s implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary)", ZSTR_VAL(class_type->name));
+		if (EG(exception)) {
+			zend_exception_uncaught_error(
+				"During inheritance of %s, while implementing Serializable", ZSTR_VAL(class_type->name));
+		}
 	}
 	return SUCCESS;
 }