diff --git a/boa/src/builtins/array_buffer/mod.rs b/boa/src/builtins/array_buffer/mod.rs
index cfd05c3c315..a02f1db278b 100644
--- a/boa/src/builtins/array_buffer/mod.rs
+++ b/boa/src/builtins/array_buffer/mod.rs
@@ -628,7 +628,7 @@ impl ArrayBuffer {
 
         // 6. Else, let rawValue be a List whose elements are bytes from block at indices byteIndex (inclusive) through byteIndex + elementSize (exclusive).
         // 7. Assert: The number of elements in rawValue is elementSize.
-        let raw_value = &block[byte_index..element_size];
+        let raw_value = &block[byte_index..byte_index + element_size];
 
         // TODO: Agent Record [[LittleEndian]] filed
         // 8. If isLittleEndian is not present, set isLittleEndian to the value of the [[LittleEndian]] field of the surrounding agent's Agent Record.