diff --git a/CHANGES.md b/CHANGES.md
index f37744d2cf..5ab729b844 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -14,6 +14,7 @@ Bug Fixes
 * [#1127](https://github.com/java-native-access/jna/issues/1127): Windows needs a wide string in `c.s.j.p.win32.COM.IShellFolder#ParseDisplayName` - [@dbwiddis](https://github.com/dbwiddis).
 * [#1128](https://github.com/java-native-access/jna/issues/1128): KEY_ALL_ACCESS value is incorrect in `c.s.j.p.win32.WinNT.java` - [@trevormaggs](https://github.com/trevormaggs).
 * [#1133](https://github.com/java-native-access/jna/issues/1133): Ensure JARs created from the build system don't contain invalid `Info-ZIP Unicode Path` extra info - [@matthiasblaesing](https://github.com/matthiasblaesing).
+* [#1134](https://github.com/java-native-access/jna/issues/1134): Read correct member of `WinBase.SYSTEM_INFO.processorArchitecture` union - [@dbwiddis](https://github.com/dbwiddis).
 
 Release 5.4.0
 =============
diff --git a/contrib/platform/src/com/sun/jna/platform/win32/WinBase.java b/contrib/platform/src/com/sun/jna/platform/win32/WinBase.java
index 296ade5d63..74e114c41d 100755
--- a/contrib/platform/src/com/sun/jna/platform/win32/WinBase.java
+++ b/contrib/platform/src/com/sun/jna/platform/win32/WinBase.java
@@ -1176,6 +1176,18 @@ public static class ByReference extends UNION implements Structure.ByReference {
              * Processor architecture (unnamed struct).
              */
             public PI pi;
+
+            @Override
+            public void read() {
+                // dwOemID is obsolete but users may have come to rely on its value because it
+                // was initialized by default, so we retain its initialization for
+                // compatibility.
+                setType("dwOemID");
+                super.read();
+                // pi requires type defined for initialization as a structure.
+                setType("pi");
+                super.read();
+            }
         }
 
         /**
diff --git a/contrib/platform/test/com/sun/jna/platform/win32/Kernel32Test.java b/contrib/platform/test/com/sun/jna/platform/win32/Kernel32Test.java
index 5426a57368..4a30d1f1c9 100644
--- a/contrib/platform/test/com/sun/jna/platform/win32/Kernel32Test.java
+++ b/contrib/platform/test/com/sun/jna/platform/win32/Kernel32Test.java
@@ -524,6 +524,10 @@ public void testGetSystemInfo() {
         SYSTEM_INFO lpSystemInfo = new SYSTEM_INFO();
         Kernel32.INSTANCE.GetSystemInfo(lpSystemInfo);
         assertTrue(lpSystemInfo.dwNumberOfProcessors.intValue() > 0);
+        // the dwOemID member is obsolete, but gets a value.
+        // the pi member is a structure and isn't read by default
+        assertEquals(lpSystemInfo.processorArchitecture.dwOemID.getLow(),
+                lpSystemInfo.processorArchitecture.pi.wProcessorArchitecture);
     }
 
     public void testGetSystemTimes() {