diff --git a/test/hotspot/jtreg/compiler/c2/irTests/TestVectorizeTypeConversion.java b/test/hotspot/jtreg/compiler/c2/irTests/TestVectorizeTypeConversion.java
index c8a09e4aad8c6..9255bf4aeeef6 100644
--- a/test/hotspot/jtreg/compiler/c2/irTests/TestVectorizeTypeConversion.java
+++ b/test/hotspot/jtreg/compiler/c2/irTests/TestVectorizeTypeConversion.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022, Arm Limited. All rights reserved.
+ * Copyright (c) 2022, 2023, Arm Limited. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -57,7 +57,10 @@ public static void main(String[] args) {
     @Test
     @IR(counts = {IRNode.LOAD_VECTOR, ">0",
                   IRNode.VECTOR_CAST_I2X, ">0",
-                  IRNode.STORE_VECTOR, ">0"})
+                  IRNode.STORE_VECTOR, ">0"},
+        // The vectorization of some conversions may fail when `+AlignVector`.
+        // We can remove the condition after JDK-8303827.
+        applyIf = {"AlignVector", "false"})
     private static void testConvI2D(double[] d, int[] a) {
         for(int i = 0; i < d.length; i++) {
             d[i] = (double) (a[i]);
diff --git a/test/hotspot/jtreg/compiler/vectorization/runner/ArrayTypeConvertTest.java b/test/hotspot/jtreg/compiler/vectorization/runner/ArrayTypeConvertTest.java
index b729fa8f9985c..f7f3dc3943141 100644
--- a/test/hotspot/jtreg/compiler/vectorization/runner/ArrayTypeConvertTest.java
+++ b/test/hotspot/jtreg/compiler/vectorization/runner/ArrayTypeConvertTest.java
@@ -143,6 +143,9 @@ public float[] convertIntToFloat() {
 
     @Test
     @IR(applyIfCPUFeatureOr = {"asimd", "true", "avx", "true"},
+        // The vectorization of some conversions may fail when `+AlignVector`.
+        // We can remove the condition after JDK-8303827.
+        applyIf = {"AlignVector", "false"},
         counts = {IRNode.VECTOR_CAST_I2X, ">0"})
     public double[] convertIntToDouble() {
         double[] res = new double[SIZE];
@@ -230,6 +233,9 @@ public int[] convertFloatToInt() {
 
     @Test
     @IR(applyIfCPUFeatureOr = {"asimd", "true", "avx512dq", "true"},
+        // The vectorization of some conversions may fail when `+AlignVector`.
+        // We can remove the condition after JDK-8303827.
+        applyIf = {"AlignVector", "false"},
         counts = {IRNode.VECTOR_CAST_F2X, ">0"})
     public long[] convertFloatToLong() {
         long[] res = new long[SIZE];
@@ -311,6 +317,9 @@ public char[] convertDoubleToChar() {
     // ---------------- Convert Between F & D ----------------
     @Test
     @IR(applyIfCPUFeatureOr = {"asimd", "true", "avx", "true"},
+        // The vectorization of some conversions may fail when `+AlignVector`.
+        // We can remove the condition after JDK-8303827.
+        applyIf = {"AlignVector", "false"},
         counts = {IRNode.VECTOR_CAST_F2X, ">0"})
     public double[] convertFloatToDouble() {
         double[] res = new double[SIZE];