diff --git a/src/mol-data/util/chunked-array.ts b/src/mol-data/util/chunked-array.ts
index b7ad2bd187901cf6243f71503258f2170fb6f488..bd4dd10867fce9c72076b12055524ab0e1de21a9 100644
--- a/src/mol-data/util/chunked-array.ts
+++ b/src/mol-data/util/chunked-array.ts
@@ -144,7 +144,7 @@ namespace ChunkedArray {
             ctor,
             elementSize,
 
-            growBy: Math.floor(chunkSize),
+            growBy: Math.max(1, Math.ceil(chunkSize)),
             allocatedSize: 0,
             elementCount: 0,