diff --git a/lib/internal/process.js b/lib/internal/process.js
index 0e822c9cff5..f6434e1669c 100644
--- a/lib/internal/process.js
+++ b/lib/internal/process.js
@@ -248,7 +248,7 @@ function setupSignalHandlers() {
         process.emit('SIGINT');
       };
 
-      const signum = constants['SIGINT'];
+      const signum = constants.SIGINT;
       const err = wrap.start(signum);
       if (err) {
         wrap.close();
diff --git a/lib/trace_mgr.js b/lib/trace_mgr.js
index 51666ff166a..a622d2a1585 100644
--- a/lib/trace_mgr.js
+++ b/lib/trace_mgr.js
@@ -263,11 +263,11 @@ function updateGlobalSampleStats(eventKind) {
   currentSampleRate[eventKind] *= emitOptions.backoffFactors[eventKind];
 
   var updateTime = new Date();
-  emitMinTimeValue['emitOnLogWarn'] = new Date(updateTime);
-  emitMinTimeValue['emitOnLogError'] = new Date(updateTime);
+  emitMinTimeValue.emitOnLogWarn = new Date(updateTime);
+  emitMinTimeValue.emitOnLogError = new Date(updateTime);
 
   if (eventKind === 'emitOnAssert') {
-    emitMinTimeValue['emitOnAssert'] = updateTime;
+    emitMinTimeValue.emitOnAssert = updateTime;
   }
 }
 
diff --git a/src/node.cc b/src/node.cc
index b0d531d923d..b3deb67e440 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -124,7 +124,7 @@ bool s_doTTRecord = false;
 bool s_doTTReplay = false;
 bool s_doTTEnableDebug = false;
 size_t s_ttoptReplayUriLength = 0;
-const char* s_ttoptReplayUri = NULL;
+const char* s_ttoptReplayUri = nullptr;
 uint32_t s_ttdSnapInterval = 2000;
 uint32_t s_ttdSnapHistoryLength = 2;
 uint64_t s_ttdStartupMode = 0x1;