diff --git a/src/lib/commits.js b/src/lib/commits.js
index cbb2d537..377e504f 100644
--- a/src/lib/commits.js
+++ b/src/lib/commits.js
@@ -49,6 +49,9 @@ module.exports = function (config, cb) {
   function extract () {
     exec(
       'git log -E --format=%H==SPLIT==%B==END== ' + range,
+      {
+        maxBuffer: 1024 * 1024 // 1MB instead of 220KB (issue #286)
+      },
       function (err, stdout) {
         if (err) return cb(err)
 
diff --git a/test/mocks/child-process.js b/test/mocks/child-process.js
index 123f5b37..87b68bea 100644
--- a/test/mocks/child-process.js
+++ b/test/mocks/child-process.js
@@ -4,7 +4,10 @@ const rawCommits = [
 ]
 
 module.exports = {
-  exec: function (command, cb) {
+  exec: function (command, options, cb) {
+    if (typeof cb === 'undefined' && typeof options === 'function') {
+      cb = options
+    }
     if (/contains/.test(command)) {
       if (/notinhistory/.test(command)) return cb(new Error())
       return cb(null, 'whatever\nmaster\n')