diff --git a/CHANGES.md b/CHANGES.md
index 75c91fd..cbc0253 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -8,7 +8,8 @@ Known issues:
 
 ## bunyan 1.3.5 (not yet released)
 
-- [issue #242] Be defensive on err.stack not being a string.
+- [issue #233] Make `bunyan` defensive on res.header as a boolean.
+- [issue #242] Make `bunyan` defensive on err.stack not being a string.
 
 
 ## bunyan 1.3.4
diff --git a/bin/bunyan b/bin/bunyan
index e4e387b..096db52 100755
--- a/bin/bunyan
+++ b/bin/bunyan
@@ -927,15 +927,18 @@ function emitRecord(rec, line, opts, stylize) {
             // and object of header key/value pairs. Prefer `res.header` if set
             // (TODO: Why? I don't recall. Typical of restify serializer?
             // Typical JSON.stringify of a core node HttpResponse?)
+            var headerTypes = {string: true, object: true};
             var headers;
-            if (res.header !== undefined) {
+            if (res.header !== undefined && headerTypes[typeof (res.header)]) {
                 headers = res.header;
                 delete res.header;
-            } else if (res.headers !== undefined) {
+            } else if (res.headers !== undefined &&
+                headerTypes[typeof (res.headers)])
+            {
                 headers = res.headers;
                 delete res.headers;
             }
-            if (!headers) {
+            if (headers === undefined) {
                 /* pass through */
             } else if (typeof (headers) === 'string') {
                 s += headers.trimRight();