diff --git a/reactos/dll/win32/user32/include/user32p.h b/reactos/dll/win32/user32/include/user32p.h
index 760d1991c9b..24a9c9f4d82 100644
--- a/reactos/dll/win32/user32/include/user32p.h
+++ b/reactos/dll/win32/user32/include/user32p.h
@@ -186,6 +186,7 @@ extern int SPY_Init(void);
 #define VALIDATE_TYPE_CALLPROC 7
 #define VALIDATE_TYPE_ACCEL    8
 #define VALIDATE_TYPE_MONITOR  12
+#define VALIDATE_TYPE_EVENT    15
 
 #define FIRST_USER_HANDLE 0x0020  /* first possible value for low word of user handle */
 #define LAST_USER_HANDLE  0xffef  /* last possible value for low word of user handle */
diff --git a/reactos/dll/win32/user32/misc/misc.c b/reactos/dll/win32/user32/misc/misc.c
index bbe7322e44c..84bb9613a61 100644
--- a/reactos/dll/win32/user32/misc/misc.c
+++ b/reactos/dll/win32/user32/misc/misc.c
@@ -336,7 +336,7 @@ GetUser32Handle(HANDLE handle)
 /*
  * Decide whether an object is located on the desktop or shared heap
  */
-static const BOOL g_ObjectHeapTypeShared[VALIDATE_TYPE_MONITOR + 1] =
+static const BOOL g_ObjectHeapTypeShared[VALIDATE_TYPE_EVENT + 1] =
 {
     FALSE, /* VALIDATE_TYPE_FREE (not used) */
     TRUE, /* VALIDATE_TYPE_WIN */ /* FIXME: FALSE once WINDOW_OBJECT is deleted! */
@@ -350,7 +350,10 @@ static const BOOL g_ObjectHeapTypeShared[VALIDATE_TYPE_MONITOR + 1] =
     FALSE, /* (not used) */
     FALSE, /* (not used) */
     FALSE, /* (not used) */
-    TRUE /* VALIDATE_TYPE_MONITOR */
+    TRUE, /* VALIDATE_TYPE_MONITOR */
+    FALSE, /* (not used) */
+    FALSE, /* (not used) */
+    TRUE  /* VALIDATE_TYPE_EVENT */
 };
 
 //
@@ -363,7 +366,7 @@ ValidateHandle(HANDLE handle, UINT uType)
   PVOID ret;
   PUSER_HANDLE_ENTRY pEntry;
 
-  ASSERT(uType <= VALIDATE_TYPE_MONITOR);
+  ASSERT(uType <= VALIDATE_TYPE_EVENT);
 
   pEntry = GetUser32Handle(handle);
 
@@ -418,7 +421,7 @@ ValidateHandleNoErr(HANDLE handle, UINT uType)
   PVOID ret;
   PUSER_HANDLE_ENTRY pEntry;
 
-  ASSERT(uType <= VALIDATE_TYPE_MONITOR);
+  ASSERT(uType <= VALIDATE_TYPE_EVENT);
 
   pEntry = GetUser32Handle(handle);
 
diff --git a/reactos/subsystems/win32/win32k/include/object.h b/reactos/subsystems/win32/win32k/include/object.h
index 33ed973368c..32c32fb2e31 100644
--- a/reactos/subsystems/win32/win32k/include/object.h
+++ b/reactos/subsystems/win32/win32k/include/object.h
@@ -50,7 +50,8 @@ typedef enum _USER_OBJECT_TYPE
   otHook = 5,
   otCallProc = 7,
   otAccel,
-  otMonitor = 12
+  otMonitor = 12,
+  otEvent = 15
 
 } USER_OBJECT_TYPE;