diff --git a/implementations/javascript/packages/core/src/encoder.ts b/implementations/javascript/packages/core/src/encoder.ts
index a24ed5f..0e222bd 100644
--- a/implementations/javascript/packages/core/src/encoder.ts
+++ b/implementations/javascript/packages/core/src/encoder.ts
@@ -83,7 +83,9 @@ export class EncoderState {
             return new Bytes(this.view.buffer.slice(0, resultLength));
         } else {
             this.rotatebuffer(4096);
-            return Bytes.concat(this.chunks);
+            const chunks = this.chunks;
+            this.chunks = [];
+            return Bytes.concat(chunks);
         }
     }
 
@@ -95,7 +97,9 @@ export class EncoderState {
             return s;
         } else {
             this.rotatebuffer(4096);
-            return this.chunks.map(asLatin1).join('');
+            const chunks = this.chunks;
+            this.chunks = [];
+            return chunks.map(asLatin1).join('');
         }
     }