diff --git a/reactos/dll/win32/kernel32/client/i386/fiber.S b/reactos/dll/win32/kernel32/client/i386/fiber.S
index 9a34e790717..8c33c9a596f 100644
--- a/reactos/dll/win32/kernel32/client/i386/fiber.S
+++ b/reactos/dll/win32/kernel32/client/i386/fiber.S
@@ -26,6 +26,7 @@ FUNC _BaseFiberStartup@0
     /* Start the thread with our parameters */
     push dword ptr [eax+FIBER_CONTEXT_EBX]
     push dword ptr [eax+FIBER_CONTEXT_EAX]
+    push 0
     jmp _BaseThreadStartup@8
 
 ENDFUNC