diff --git a/lib/platform/bitbucket/index.js b/lib/platform/bitbucket/index.js
index 0b649888d6a1781523c6731bf788ae472467607c..2d59f527acf4a9a3136c263f459940acfffacc47 100644
--- a/lib/platform/bitbucket/index.js
+++ b/lib/platform/bitbucket/index.js
@@ -473,7 +473,10 @@ async function mergePr(prNo, branchName) {
 
 function getPrBody(input) {
   // Remove any HTML we use
-  return input.replace(/<\/?summary>/g, '**').replace(/<\/?details>/g, '');
+  return input
+    .replace(/<\/?summary>/g, '**')
+    .replace(/<\/?details>/g, '')
+    .substring(0, 50000);
 }
 
 // Return the commit SHA for a branch