diff --git a/lib/utils/util.js b/lib/utils/util.js
index 90e7cdbf..84dd6c86 100644
--- a/lib/utils/util.js
+++ b/lib/utils/util.js
@@ -855,6 +855,9 @@ util.toFixed = function toFixed(num, exp) {
   assert(lo.length <= exp, 'Invalid integer value.');
 
   if (lo.length === 0)
+    lo = '0';
+
+  if (exp === 0)
     return `${sign}${hi}`;
 
   return `${sign}${hi}.${lo}`;