diff --git a/src/nt.h b/src/nt.h
index ec9bfab..07a9eb6 100644
--- a/src/nt.h
+++ b/src/nt.h
@@ -59,6 +59,11 @@ typedef struct _OBJECT_ATTRIBUTES {
 #define FILE_OPEN 0x00000001UL
 #endif
 
+#define KEYEDEVENT_WAIT 0x00000001UL
+#define KEYEDEVENT_WAKE 0x00000002UL
+#define KEYEDEVENT_ALL_ACCESS \
+  (STANDARD_RIGHTS_REQUIRED | KEYEDEVENT_WAIT | KEYEDEVENT_WAKE)
+
 #define NT_NTDLL_IMPORT_LIST(X)           \
   X(NTSTATUS,                             \
     NTAPI,                                \
diff --git a/src/reflock.c b/src/reflock.c
index 67ff48b..fe5ac12 100644
--- a/src/reflock.c
+++ b/src/reflock.c
@@ -20,7 +20,7 @@ static HANDLE reflock__keyed_event = NULL;
 
 int reflock_global_init(void) {
   NTSTATUS status =
-      NtCreateKeyedEvent(&reflock__keyed_event, ~(ACCESS_MASK) 0, NULL, 0);
+      NtCreateKeyedEvent(&reflock__keyed_event, KEYEDEVENT_ALL_ACCESS, NULL, 0);
   if (status != STATUS_SUCCESS)
     return_set_error(-1, RtlNtStatusToDosError(status));
   return 0;