diff --git a/core/src/avm2/array.rs b/core/src/avm2/array.rs
index 9c499cab19fc6..fa69388c7271d 100644
--- a/core/src/avm2/array.rs
+++ b/core/src/avm2/array.rs
@@ -316,8 +316,8 @@ impl<'gc> ArrayStorage<'gc> {
 
     /// Convert the array to a dense representation if it meets the criteria.
     fn maybe_convert_to_dense(&mut self) {
-        if let ArrayStorage::Sparse { length, .. } = self {
-            if *length < MIN_SPARSE_LENGTH {
+        if let ArrayStorage::Sparse { storage, length } = self {
+            if storage.is_empty() && *length == 0 {
                 *self = ArrayStorage::Dense {
                     storage: Vec::new(),
                     occupied_count: 0,