diff --git a/reactos/include/ddk/ntifs.h b/reactos/include/ddk/ntifs.h
index 3c35399d69e..982bef28de4 100644
--- a/reactos/include/ddk/ntifs.h
+++ b/reactos/include/ddk/ntifs.h
@@ -5213,6 +5213,7 @@ KeRemoveQueueEx(
 #define ExDisableResourceBoost ExDisableResourceBoostLite
 
 VOID
+NTAPI
 ExInitializePushLock(
   _Out_ PEX_PUSH_LOCK PushLock);
 
diff --git a/reactos/include/xdk/exfuncs.h b/reactos/include/xdk/exfuncs.h
index a60908fbe76..503c07a7145 100644
--- a/reactos/include/xdk/exfuncs.h
+++ b/reactos/include/xdk/exfuncs.h
@@ -379,6 +379,7 @@ $if (_NTIFS_)
 #define ExDisableResourceBoost ExDisableResourceBoostLite
 
 VOID
+NTAPI
 ExInitializePushLock(
   _Out_ PEX_PUSH_LOCK PushLock);
 $endif (_NTIFS_)