diff --git a/ext/intl/uchar/tests/bug70455.phpt b/ext/intl/uchar/tests/bug70455.phpt
new file mode 100644
index 00000000000..00ee8984a0d
--- /dev/null
+++ b/ext/intl/uchar/tests/bug70455.phpt
@@ -0,0 +1,13 @@
+--TEST--
+Bug #70455 Missing constant: IntlChar::NO_NUMERIC_VALUE
+--SKIPIF--
+<?php if (!extension_loaded('intl')) die("skip requires ext/intl") ?>
+--FILE--
+<?php
+$value = IntlChar::getNumericValue("x");
+var_dump($value);
+var_dump($value === IntlChar::NO_NUMERIC_VALUE);
+?>
+--EXPECT--
+float(-123456789)
+bool(true)
diff --git a/ext/intl/uchar/uchar.c b/ext/intl/uchar/uchar.c
index 8fb09f9f829..755a6c9acb3 100644
--- a/ext/intl/uchar/uchar.c
+++ b/ext/intl/uchar/uchar.c
@@ -737,6 +737,7 @@ int php_uchar_minit(INIT_FUNC_ARGS) {
 	IC_CONSTL("CODEPOINT_MAX", UCHAR_MAX_VALUE)
 	IC_CONSTL("FOLD_CASE_DEFAULT", U_FOLD_CASE_DEFAULT)
 	IC_CONSTL("FOLD_CASE_EXCLUDE_SPECIAL_I", U_FOLD_CASE_EXCLUDE_SPECIAL_I)
+	zend_declare_class_constant_double(ce, "NO_NUMERIC_VALUE", sizeof("NO_NUMERIC_VALUE")-1, U_NO_NUMERIC_VALUE);
 
 	/* All enums used by the uchar APIs.  There are a LOT of them,
 	 * so they're separated out into include files,