diff --git a/lib/bunyan.js b/lib/bunyan.js
index 405cdb24..ebe7e0f7 100644
--- a/lib/bunyan.js
+++ b/lib/bunyan.js
@@ -518,7 +518,7 @@ function Logger(options, _childOptions, _childSimple) {
     if (!fields.hostname && !self.fields.hostname) {
         fields.hostname = os.hostname();
     }
-    if (!fields.pid) {
+    if (!fields.pid && runtimeEnv !== 'browser') {
         fields.pid = process.pid;
     }
     Object.keys(fields).forEach(function (k) {
@@ -950,7 +950,8 @@ function mkRecord(log, minLevel, args) {
         // `log.<level>(msg, ...)`
         fields = null;
         msgArgs = args.slice();
-    } else if (Buffer.isBuffer(args[0])) {  // `log.<level>(buf, ...)`
+    } else if (typeof (Buffer) !== 'undefined' && Buffer.isBuffer(args[0])) {
+        // `log.<level>(buf, ...)`
         // Almost certainly an error, show `inspect(buf)`. See bunyan
         // issue #35.
         fields = null;