diff --git a/test/functional/Java17andUp/src_170/org/openj9/test/jep389/upcall/UpcallMHWithMixedSigStruTests.java b/test/functional/Java17andUp/src_170/org/openj9/test/jep389/upcall/UpcallMHWithMixedSigStruTests.java
index 356b83a7a4e..233a73df7f7 100644
--- a/test/functional/Java17andUp/src_170/org/openj9/test/jep389/upcall/UpcallMHWithMixedSigStruTests.java
+++ b/test/functional/Java17andUp/src_170/org/openj9/test/jep389/upcall/UpcallMHWithMixedSigStruTests.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2021, 2022 IBM Corp. and others
+ * Copyright (c) 2021, 2023 IBM Corp. and others
  *
  * This program and the accompanying materials are made available under
  * the terms of the Eclipse Public License 2.0 which accompanies this
@@ -859,12 +859,12 @@ public void test_addDoubleAndFloatDoubleFloatFromStructByUpcallMH() throws Throw
 
 	@Test
 	public void test_addDoubleAndIntDoubleLongFromStructByUpcallMH() throws Throwable {
-		/* The size of [int, double, long] on AIX/PPC 64-bit is 16 bytes without padding by default
+		/* The size of [int, double, long] on AIX/PPC 64-bit is 20 bytes without padding by default
 		 * while the same struct is 24 bytes with padding on other platforms.
 		 */
-		GroupLayout structLayout = isAixOS ? MemoryLayout.structLayout(C_INT.withName("elem1"),
-				C_DOUBLE.withName("elem2"), longLayout.withName("elem3")) : MemoryLayout.structLayout(C_INT.withName("elem1"),
-						MemoryLayout.paddingLayout(32), C_DOUBLE.withName("elem2"), longLayout.withName("elem3"));
+		GroupLayout structLayout = isAixOS ? MemoryLayout.structLayout(C_INT.withName("elem1"), C_DOUBLE.withName("elem2"),
+								longLayout.withName("elem3").withBitAlignment(32)) : MemoryLayout.structLayout(C_INT.withName("elem1"),
+								MemoryLayout.paddingLayout(32), C_DOUBLE.withName("elem2"), longLayout.withName("elem3"));
 		VarHandle elemHandle1 = structLayout.varHandle(int.class, PathElement.groupElement("elem1"));
 		VarHandle elemHandle2 = structLayout.varHandle(double.class, PathElement.groupElement("elem2"));
 		VarHandle elemHandle3 = structLayout.varHandle(long.class, PathElement.groupElement("elem3"));
diff --git a/test/functional/Java17andUp/src_170/org/openj9/test/jep389/upcall/UpcallMethodHandles.java b/test/functional/Java17andUp/src_170/org/openj9/test/jep389/upcall/UpcallMethodHandles.java
index a0986e73315..e55e962c2e0 100644
--- a/test/functional/Java17andUp/src_170/org/openj9/test/jep389/upcall/UpcallMethodHandles.java
+++ b/test/functional/Java17andUp/src_170/org/openj9/test/jep389/upcall/UpcallMethodHandles.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2021, 2022 IBM Corp. and others
+ * Copyright (c) 2021, 2023 IBM Corp. and others
  *
  * This program and the accompanying materials are made available under
  * the terms of the Eclipse Public License 2.0 which accompanies this
@@ -2585,11 +2585,11 @@ public static double addDoubleAndFloatDoubleFloatFromStruct(double arg1, MemoryS
 	}
 
 	public static double addDoubleAndIntDoubleLongFromStruct(double arg1, MemorySegment arg2) {
-		/* The size of [int, double, long] on AIX/PPC 64-bit is 16 bytes without padding by default
+		/* The size of [int, double, long] on AIX/PPC 64-bit is 20 bytes without padding by default
 		 * while the same struct is 24 bytes with padding on other platforms.
 		 */
 		GroupLayout structLayout = isAixOS ? MemoryLayout.structLayout(C_INT.withName("elem1"),
-				C_DOUBLE.withName("elem2"), longLayout.withName("elem3"))
+				C_DOUBLE.withName("elem2"), longLayout.withName("elem3").withBitAlignment(32))
 				: MemoryLayout.structLayout(C_INT.withName("elem1"), MemoryLayout.paddingLayout(32),
 						C_DOUBLE.withName("elem2"), longLayout.withName("elem3"));
 		VarHandle elemHandle1 = structLayout.varHandle(int.class, PathElement.groupElement("elem1"));
diff --git a/test/functional/Java19andUp/src/org/openj9/test/jep424/upcall/UpcallMHWithMixedSigStruTests.java b/test/functional/Java19andUp/src/org/openj9/test/jep424/upcall/UpcallMHWithMixedSigStruTests.java
index f8066b36d38..1deb8deda66 100644
--- a/test/functional/Java19andUp/src/org/openj9/test/jep424/upcall/UpcallMHWithMixedSigStruTests.java
+++ b/test/functional/Java19andUp/src/org/openj9/test/jep424/upcall/UpcallMHWithMixedSigStruTests.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2021, 2022 IBM Corp. and others
+ * Copyright (c) 2021, 2023 IBM Corp. and others
  *
  * This program and the accompanying materials are made available under
  * the terms of the Eclipse Public License 2.0 which accompanies this
@@ -821,7 +821,7 @@ public void test_addDoubleAndFloatDoubleFloatFromStructByUpcallMH() throws Throw
 
 	@Test
 	public void test_addDoubleAndIntDoubleLongFromStructByUpcallMH() throws Throwable {
-		/* The size of [int, double, long] on AIX/PPC 64-bit is 16 bytes without padding by default
+		/* The size of [int, double, long] on AIX/PPC 64-bit is 20 bytes without padding by default
 		 * while the same struct is 24 bytes with padding on other platforms.
 		 */
 		GroupLayout structLayout = isAixOS ? MemoryLayout.structLayout(JAVA_INT.withName("elem1"),
diff --git a/test/functional/Java19andUp/src/org/openj9/test/jep424/upcall/UpcallMethodHandles.java b/test/functional/Java19andUp/src/org/openj9/test/jep424/upcall/UpcallMethodHandles.java
index 2fe9b53d0d3..cd50970a819 100644
--- a/test/functional/Java19andUp/src/org/openj9/test/jep424/upcall/UpcallMethodHandles.java
+++ b/test/functional/Java19andUp/src/org/openj9/test/jep424/upcall/UpcallMethodHandles.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2021, 2022 IBM Corp. and others
+ * Copyright (c) 2021, 2023 IBM Corp. and others
  *
  * This program and the accompanying materials are made available under
  * the terms of the Eclipse Public License 2.0 which accompanies this
@@ -1853,7 +1853,7 @@ public static double addDoubleAndFloatDoubleFloatFromStruct(double arg1, MemoryS
 
 	public static double addDoubleAndIntDoubleLongFromStruct(double arg1, MemorySegment arg2) {
 		int structElem1 = arg2.get(JAVA_INT, 0);
-		/* The size of [int, double, long] on AIX/PPC 64-bit is 16 bytes without padding by default
+		/* The size of [int, double, long] on AIX/PPC 64-bit is 20 bytes without padding by default
 		 * while the same struct is 24 bytes with padding on other platforms.
 		 */
 		double structElem2 = (isAixOS) ? arg2.get(JAVA_DOUBLE.withBitAlignment(32), 4) : arg2.get(JAVA_DOUBLE, 8);