diff --git a/CHANGES.md b/CHANGES.md
index 5e28d10f60..6417de12b9 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -22,7 +22,8 @@ Features
 * [#547](https://github.com/java-native-access/jna/pull/547): Added `GetSystemTimes` to `com.sun.jna.platform.win32.Kernel32` - [@dbwiddis](https://github.com/dbwiddis).
 * [#548](https://github.com/java-native-access/jna/pull/548): Return 64-bit unsigned integer from `com.sun.jna.platform.win32.WinBase.FILETIME` - [@dbwiddis](https://github.com/dbwiddis).
 * [#524](https://github.com/java-native-access/jna/pull/524): Added IShellFolder interface plus necessary utility functions to Windows platform, and a sample for enumerating objects in My Computer - [@lwahonen](https://github.com/lwahonen).
-* [#484](https://github.com/twall/jna/pull/484): Added `XFetchName` to `X11` interface - [@pinaf](https://github.com/pinaf).
+* [#471](https://github.com/java-native-access/jna/issues/471): Determine size of native `bool` - [@twall](https://github.com/twall).
+* [#484](https://github.com/java-native-access/jna/pull/484): Added `XFetchName` to `X11` interface - [@pinaf](https://github.com/pinaf).
 * [#554](https://github.com/java-native-access/jna/pull/554): Initial code for a few Unix 'libc' API(s) [@lgoldstein](https://github.com/lgoldstein)
 * [#552](https://github.com/java-native-access/jna/pull/552): Added `Module32FirstW` and `Module32NextW` to `com.sun.jna.platform.win32.Kernel32` (and helper to `com.sun.jna.platform.win32.Kernel32Util`) and `MODULEENTRY32W` structure to `com.sun.jna.platform.win32.Tlhelp32` - [@mlfreeman2](https://github.com/mlfreeman2).
 * [#564](https://github.com/java-native-access/jna/pull/564): Use generic definition of Native#loadLibrary [@lgoldstein](https://github.com/lgoldstein)
diff --git a/native/dispatch.c b/native/dispatch.c
index ecefb146f3..a71fc6600b 100644
--- a/native/dispatch.c
+++ b/native/dispatch.c
@@ -2738,6 +2738,7 @@ Java_com_sun_jna_Native_sizeof(JNIEnv *env, jclass UNUSED(cls), jint type)
   case com_sun_jna_Native_TYPE_LONG: return sizeof(long);
   case com_sun_jna_Native_TYPE_WCHAR_T: return sizeof(wchar_t);
   case com_sun_jna_Native_TYPE_SIZE_T: return sizeof(size_t);
+  case com_sun_jna_Native_TYPE_BOOL: return sizeof(bool);
   default:
     {
       char msg[MSG_SIZE];
diff --git a/src/com/sun/jna/Native.java b/src/com/sun/jna/Native.java
index a6a9670efd..1b10bb35a8 100644
--- a/src/com/sun/jna/Native.java
+++ b/src/com/sun/jna/Native.java
@@ -124,11 +124,14 @@ public void uncaughtException(Callback c, Throwable e) {
     public static final int WCHAR_SIZE;
     /** Size of a native <code>size_t</code> type, in bytes. */
     public static final int SIZE_T_SIZE;
+    /** Size of a native <code>bool</code> type (C99 and later), in bytes. */
+    public static final int BOOL_SIZE;
 
     private static final int TYPE_VOIDP = 0;
     private static final int TYPE_LONG = 1;
     private static final int TYPE_WCHAR_T = 2;
     private static final int TYPE_SIZE_T = 3;
+    private static final int TYPE_BOOL = 4;
 
     static final int MAX_ALIGNMENT;
     static final int MAX_PADDING;
@@ -143,6 +146,7 @@ public static float parseVersion(String v) {
         LONG_SIZE = sizeof(TYPE_LONG);
         WCHAR_SIZE = sizeof(TYPE_WCHAR_T);
         SIZE_T_SIZE = sizeof(TYPE_SIZE_T);
+        BOOL_SIZE = sizeof(TYPE_BOOL);
 
         // Perform initialization of other JNA classes until *after*
         // initializing the above final fields
diff --git a/test/com/sun/jna/NativeTest.java b/test/com/sun/jna/NativeTest.java
index 1602c5c764..164d03375e 100644
--- a/test/com/sun/jna/NativeTest.java
+++ b/test/com/sun/jna/NativeTest.java
@@ -157,6 +157,10 @@ public void testCustomizeDefaultStringEncoding() {
         }
     }
 
+    public void testSizeof() {
+        assertEquals("Wrong bool size", 1, Native.BOOL_SIZE);
+    }
+
     public static interface TestLib extends Library {
         interface VoidCallback extends Callback {
             void callback();