diff --git a/lib/internal/assert/assertion_error.js b/lib/internal/assert/assertion_error.js
index 82dae694368c45..52c61c40b3a32b 100644
--- a/lib/internal/assert/assertion_error.js
+++ b/lib/internal/assert/assertion_error.js
@@ -314,13 +314,14 @@ function createErrDiff(actual, expected, operator) {
 }
 
 function addEllipsis(string) {
-  const lines = StringPrototypeSplit(string, '\n');
+  const lines = StringPrototypeSplit(string, '\n', 11);
   if (lines.length > 10) {
     lines.length = 10;
     return `${ArrayPrototypeJoin(lines, '\n')}\n...`;
   } else if (string.length > 512) {
     return `${StringPrototypeSlice(string, 512)}...`;
   }
+  return string;
 }
 
 class AssertionError extends Error {