diff --git a/lib/internal/errors.js b/lib/internal/errors.js
index cc4c955cba1588..fc306e256c1f1a 100644
--- a/lib/internal/errors.js
+++ b/lib/internal/errors.js
@@ -870,7 +870,6 @@ E('ERR_INVALID_ARG_VALUE', (name, value, reason = 'is invalid') => {
 }, TypeError, RangeError);
 E('ERR_INVALID_ARRAY_LENGTH',
   (name, len, actual) => {
-    internalAssert(typeof actual === 'number', 'actual must be of type number');
     return `The array "${name}" (length ${actual}) must be of length ${len}.`;
   }, TypeError);
 E('ERR_INVALID_ASYNC_ID', 'Invalid %s value: %s', RangeError);