diff --git a/AUTHORS b/AUTHORS
index c04aa16b04..72c23bcc83 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -70,6 +70,7 @@ Kang-Hao (Kenny) Lu <kennyluck@csail.mit.edu>
 Luis Reis <luis.m.reis@gmail.com>
 Luke Zarko <lukezarko@gmail.com>
 Maciej Małecki <me@mmalecki.com>
+Marcin Cieślak <saper@marcincieslak.com>
 Mathias Bynens <mathias@qiwi.be>
 Matt Hanselman <mjhanselman@gmail.com>
 Matthew Sporleder <msporleder@gmail.com>
diff --git a/src/runtime/runtime-i18n.cc b/src/runtime/runtime-i18n.cc
index 18e9aee126..3da71a98ef 100644
--- a/src/runtime/runtime-i18n.cc
+++ b/src/runtime/runtime-i18n.cc
@@ -626,7 +626,7 @@ RUNTIME_FUNCTION(Runtime_CreateBreakIterator) {
 
   local_object->SetInternalField(0, reinterpret_cast<Smi*>(break_iterator));
   // Make sure that the pointer to adopted text is NULL.
-  local_object->SetInternalField(1, reinterpret_cast<Smi*>(NULL));
+  local_object->SetInternalField(1, static_cast<Smi*>(nullptr));
 
   Factory* factory = isolate->factory();
   Handle<String> key = factory->NewStringFromStaticChars("breakIterator");
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index e15741cc24..1f563f956c 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -128,7 +128,7 @@ TEST(HandleNull) {
   Isolate* isolate = CcTest::i_isolate();
   HandleScope outer_scope(isolate);
   LocalContext context;
-  Handle<Object> n(reinterpret_cast<Object*>(NULL), isolate);
+  Handle<Object> n(static_cast<Object*>(nullptr), isolate);
   CHECK(!n.is_null());
 }
 
@@ -1986,7 +1986,7 @@ TEST(TestAlignmentCalculations) {
       Heap::GetMaximumFillToAlign(kSimd128Unaligned);
   CHECK_EQ(maximum_simd128_misalignment, max_simd128_unaligned_fill);
 
-  Address base = reinterpret_cast<Address>(NULL);
+  Address base = static_cast<Address>(NULL);
   int fill = 0;
 
   // Word alignment never requires fill.