diff --git a/modules/rostests/apitests/win32nt/CMakeLists.txt b/modules/rostests/apitests/win32nt/CMakeLists.txt
index 7060f79f219..a861830bbc0 100644
--- a/modules/rostests/apitests/win32nt/CMakeLists.txt
+++ b/modules/rostests/apitests/win32nt/CMakeLists.txt
@@ -52,6 +52,7 @@ list(APPEND SOURCE
 #    ntuser/NtUserEnumDisplayMonitors.c
     ntuser/NtUserEnumDisplaySettings.c
     ntuser/NtUserFindExistingCursorIcon.c
+    ntuser/NtUserGetAsyncKeyState.c
     ntuser/NtUserGetClassInfo.c
 #    ntuser/NtUserGetIconInfo.c
     ntuser/NtUserGetKeyboardLayoutName.c
diff --git a/modules/rostests/apitests/win32nt/ntuser/NtUserGetAsyncKeyState.c b/modules/rostests/apitests/win32nt/ntuser/NtUserGetAsyncKeyState.c
new file mode 100644
index 00000000000..8e5e4cab544
--- /dev/null
+++ b/modules/rostests/apitests/win32nt/ntuser/NtUserGetAsyncKeyState.c
@@ -0,0 +1,80 @@
+/*
+ * PROJECT:     ReactOS Win32k tests
+ * LICENSE:     LGPL-2.1-or-later (https://spdx.org/licenses/LGPL-2.1-or-later)
+ * PURPOSE:     Test for NtUserGetAsyncKeyState
+ * COPYRIGHT:   Copyright 2022 Thomas Faber (thomas.faber@reactos.org)
+ */
+
+#include <win32nt.h>
+
+START_TEST(NtUserGetAsyncKeyState)
+{
+    SHORT Ret;
+    DWORD Error;
+
+    SetLastError(0xdeadbeef);
+    Ret = NtUserGetAsyncKeyState(0);
+    Error = GetLastError();
+    ok(Ret == 0, "Ret = %d\n", Ret);
+    ok(Error == 0xdeadbeef, "Error = %lu\n", Error);
+
+    SetLastError(0xdeadbeef);
+    Ret = NtUserGetAsyncKeyState(1); // VK_LBUTTON
+    Error = GetLastError();
+    ok(Ret == 0 || Ret == 1, "Ret = %d\n", Ret);
+    ok(Error == 0xdeadbeef, "Error = %lu\n", Error);
+
+    SetLastError(0xdeadbeef);
+    Ret = NtUserGetAsyncKeyState(0xfe);
+    Error = GetLastError();
+    ok(Ret == 0, "Ret = %d\n", Ret);
+    ok(Error == 0xdeadbeef, "Error = %lu\n", Error);
+
+    SetLastError(0xdeadbeef);
+    Ret = NtUserGetAsyncKeyState(0xff);
+    Error = GetLastError();
+    ok(Ret == 0, "Ret = %d\n", Ret);
+    ok(Error == 0xdeadbeef, "Error = %lu\n", Error);
+
+    SetLastError(0xdeadbeef);
+    Ret = NtUserGetAsyncKeyState(0x100);
+    Error = GetLastError();
+    ok(Ret == 0, "Ret = %d\n", Ret);
+    ok(Error == ERROR_INVALID_PARAMETER, "Error = %lu\n", Error);
+
+    SetLastError(0xdeadbeef);
+    Ret = NtUserGetAsyncKeyState(0x101);
+    Error = GetLastError();
+    ok(Ret == 0, "Ret = %d\n", Ret);
+    ok(Error == ERROR_INVALID_PARAMETER, "Error = %lu\n", Error);
+
+    SetLastError(0xdeadbeef);
+    Ret = NtUserGetAsyncKeyState(0x10000000);
+    Error = GetLastError();
+    ok(Ret == 0, "Ret = %d\n", Ret);
+    ok(Error == ERROR_INVALID_PARAMETER, "Error = %lu\n", Error);
+
+    SetLastError(0xdeadbeef);
+    Ret = NtUserGetAsyncKeyState(0x7fffffff);
+    Error = GetLastError();
+    ok(Ret == 0, "Ret = %d\n", Ret);
+    ok(Error == ERROR_INVALID_PARAMETER, "Error = %lu\n", Error);
+
+    SetLastError(0xdeadbeef);
+    Ret = NtUserGetAsyncKeyState(0x80000000);
+    Error = GetLastError();
+    ok(Ret == 0, "Ret = %d\n", Ret);
+    ok(Error == ERROR_INVALID_PARAMETER, "Error = %lu\n", Error);
+
+    SetLastError(0xdeadbeef);
+    Ret = NtUserGetAsyncKeyState(-2);
+    Error = GetLastError();
+    ok(Ret == 0, "Ret = %d\n", Ret);
+    ok(Error == ERROR_INVALID_PARAMETER, "Error = %lu\n", Error);
+
+    SetLastError(0xdeadbeef);
+    Ret = NtUserGetAsyncKeyState(-1);
+    Error = GetLastError();
+    ok(Ret == 0, "Ret = %d\n", Ret);
+    ok(Error == ERROR_INVALID_PARAMETER, "Error = %lu\n", Error);
+}
diff --git a/modules/rostests/apitests/win32nt/testlist.c b/modules/rostests/apitests/win32nt/testlist.c
index 8d2be31fc2c..c63cc42c101 100644
--- a/modules/rostests/apitests/win32nt/testlist.c
+++ b/modules/rostests/apitests/win32nt/testlist.c
@@ -52,6 +52,7 @@ extern void func_NtUserCreateWindowEx(void);
 //extern void func_NtUserEnumDisplayMonitors(void);
 extern void func_NtUserEnumDisplaySettings(void);
 extern void func_NtUserFindExistingCursorIcon(void);
+extern void func_NtUserGetAsyncKeyState(void);
 extern void func_NtUserGetClassInfo(void);
 //extern void func_NtUserGetIconInfo(void);
 extern void func_NtUserGetKeyboardLayoutName(void);
@@ -120,6 +121,7 @@ const struct test winetest_testlist[] =
     //{ "NtUserEnumDisplayMonitors", func_NtUserEnumDisplayMonitors },
     { "NtUserEnumDisplaySettings", func_NtUserEnumDisplaySettings },
     { "NtUserFindExistingCursorIcon", func_NtUserFindExistingCursorIcon },
+    { "NtUserGetAsyncKeyState", func_NtUserGetAsyncKeyState },
     { "NtUserGetClassInfo", func_NtUserGetClassInfo },
     //{ "NtUserGetIconInfo", func_NtUserGetIconInfo },
     { "NtUserGetKeyboardLayoutName", func_NtUserGetKeyboardLayoutName },
diff --git a/win32ss/user/ntuser/keyboard.c b/win32ss/user/ntuser/keyboard.c
index 3d427d1cb0b..61f59296be0 100644
--- a/win32ss/user/ntuser/keyboard.c
+++ b/win32ss/user/ntuser/keyboard.c
@@ -635,7 +635,7 @@ NtUserGetAsyncKeyState(INT Key)
 
     TRACE("Enter NtUserGetAsyncKeyState\n");
 
-    if (Key >= 0x100)
+    if (Key >= 0x100 || Key < 0)
     {
         EngSetLastError(ERROR_INVALID_PARAMETER);
         ERR("Invalid parameter Key\n");