diff --git a/src/objects-inl.h b/src/objects-inl.h
index 59031d658c..d0f0f20660 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -8131,11 +8131,13 @@ void JSArray::set_length(Smi* length) {
 
 
 bool JSArray::SetLengthWouldNormalize(Heap* heap, uint32_t new_length) {
+  // This constant is somewhat arbitrary. Any large enough value would work.
+  const uint32_t kMaxFastArrayLength = 32 * 1024 * 1024;
   // If the new array won't fit in a some non-trivial fraction of the max old
   // space size, then force it to go dictionary mode.
-  uint32_t max_fast_array_size =
+  uint32_t heap_based_upper_bound =
       static_cast<uint32_t>((heap->MaxOldGenerationSize() / kDoubleSize) / 4);
-  return new_length >= max_fast_array_size;
+  return new_length >= Min(kMaxFastArrayLength, heap_based_upper_bound);
 }