diff --git a/conformance/failure_list_php_c.txt b/conformance/failure_list_php_c.txt
index eaa1b612d9..e25629deeb 100644
--- a/conformance/failure_list_php_c.txt
+++ b/conformance/failure_list_php_c.txt
@@ -58,8 +58,6 @@ Required.Proto3.JsonInput.FloatFieldInfinity.JsonOutput
 Required.Proto3.JsonInput.FloatFieldNan.JsonOutput
 Required.Proto3.JsonInput.FloatFieldNegativeInfinity.JsonOutput
 Required.Proto3.JsonInput.OneofFieldDuplicate
-Required.Proto3.JsonInput.OptionalWrapperTypesWithNonDefaultValue.JsonOutput
-Required.Proto3.JsonInput.OptionalWrapperTypesWithNonDefaultValue.ProtobufOutput
 Required.Proto3.JsonInput.RejectTopLevelNull
 Required.Proto3.JsonInput.StringFieldSurrogatePair.JsonOutput
 Required.Proto3.JsonInput.StringFieldSurrogatePair.ProtobufOutput
diff --git a/php/ext/google/protobuf/upb.c b/php/ext/google/protobuf/upb.c
index cc5a54ab84..3484b74779 100644
--- a/php/ext/google/protobuf/upb.c
+++ b/php/ext/google/protobuf/upb.c
@@ -9964,7 +9964,8 @@ static bool start_any_stringval(upb_json_parser *p) {
 
 static bool start_stringval(upb_json_parser *p) {
   if (is_top_level(p)) {
-    if (is_string_wrapper_object(p)) {
+    if (is_string_wrapper_object(p) ||
+        is_number_wrapper_object(p)) {
       start_wrapper_object(p);
     } else if (is_wellknown_msg(p, UPB_WELLKNOWN_FIELDMASK)) {
       start_fieldmask_object(p);
@@ -9977,7 +9978,8 @@ static bool start_stringval(upb_json_parser *p) {
     } else {
       return false;
     }
-  } else if (does_string_wrapper_start(p)) {
+  } else if (does_string_wrapper_start(p) ||
+             does_number_wrapper_start(p)) {
     if (!start_subobject(p)) {
       return false;
     }
@@ -10183,7 +10185,8 @@ static bool end_stringval(upb_json_parser *p) {
     return false;
   }
 
-  if (does_string_wrapper_end(p)) {
+  if (does_string_wrapper_end(p) ||
+      does_number_wrapper_end(p)) {
     end_wrapper_object(p);
     if (!is_top_level(p)) {
       end_subobject(p);
diff --git a/php/tests/encode_decode_test.php b/php/tests/encode_decode_test.php
index 5b373bb07e..f2a50180c6 100644
--- a/php/tests/encode_decode_test.php
+++ b/php/tests/encode_decode_test.php
@@ -118,12 +118,19 @@ class EncodeDecodeTest extends TestBase
         $this->assertEquals(1, $m->getValue());
     }
 
-    # public function testEncodeTopLevelInt64Value()
-    # {
-    #     $m = new Int64Value();
-    #     $m->setValue(1);
-    #     $this->assertSame("\"1\"", $m->serializeToJsonString());
-    # }
+    public function testDecodeTopLevelInt64ValueAsString()
+    {
+        $m = new Int64Value();
+        $m->mergeFromJsonString("\"1\"");
+        $this->assertEquals(1, $m->getValue());
+    }
+
+    public function testEncodeTopLevelInt64Value()
+    {
+        $m = new Int64Value();
+        $m->setValue(1);
+        $this->assertSame("\"1\"", $m->serializeToJsonString());
+    }
 
     public function testDecodeTopLevelUInt64Value()
     {
@@ -132,12 +139,19 @@ class EncodeDecodeTest extends TestBase
         $this->assertEquals(1, $m->getValue());
     }
 
-    # public function testEncodeTopLevelUInt64Value()
-    # {
-    #     $m = new UInt64Value();
-    #     $m->setValue(1);
-    #     $this->assertSame("\"1\"", $m->serializeToJsonString());
-    # }
+    public function testDecodeTopLevelUInt64ValueAsString()
+    {
+        $m = new UInt64Value();
+        $m->mergeFromJsonString("\"1\"");
+        $this->assertEquals(1, $m->getValue());
+    }
+
+    public function testEncodeTopLevelUInt64Value()
+    {
+        $m = new UInt64Value();
+        $m->setValue(1);
+        $this->assertSame("\"1\"", $m->serializeToJsonString());
+    }
 
     public function testDecodeTopLevelStringValue()
     {