diff --git a/src/xenia/kernel/xboxkrnl_threading.cc b/src/xenia/kernel/xboxkrnl_threading.cc
index 3fb5da1f2..c72f447fa 100644
--- a/src/xenia/kernel/xboxkrnl_threading.cc
+++ b/src/xenia/kernel/xboxkrnl_threading.cc
@@ -1152,6 +1152,8 @@ SHIM_CALL KeWaitForMultipleObjects_shim(
       count, objects_ptr, wait_type, wait_reason, processor_mode,
       alertable, timeout_ptr, wait_block_array_ptr);
 
+  XEASSERT(wait_type >= 0 && wait_type <= 1);
+
   X_STATUS result = X_STATUS_SUCCESS;
 
   XObject** objects = (XObject**)alloca(sizeof(XObject*) * count);
diff --git a/src/xenia/kernel/xobject.cc b/src/xenia/kernel/xobject.cc
index f406689a6..82564c3c2 100644
--- a/src/xenia/kernel/xobject.cc
+++ b/src/xenia/kernel/xobject.cc
@@ -143,7 +143,7 @@ X_STATUS XObject::WaitMultiple(
 
   DWORD result = WaitForMultipleObjectsEx(
       count, wait_handles,
-      wait_type ? TRUE : FALSE, timeout_ms, alertable);
+      wait_type ? FALSE : TRUE, timeout_ms, alertable);
 
   return result;
 }