diff --git a/tests/parser/syntax/test_dynamic_array.py b/tests/parser/syntax/test_dynamic_array.py
index 0c23bf67da..025a460758 100644
--- a/tests/parser/syntax/test_dynamic_array.py
+++ b/tests/parser/syntax/test_dynamic_array.py
@@ -1,11 +1,17 @@
 import pytest
 
 from vyper import compiler
-from vyper.exceptions import StructureException
+from vyper.exceptions import ArrayIndexException, StructureException
 
 fail_list = [
     (
         """
+foo: DynArray[uint256, 2.5]
+    """,
+        StructureException,
+    ),
+    (
+        """
 foo: DynArray[HashMap[uint8, uint8], 2]
     """,
         StructureException,