diff --git a/reactos/subsystems/csr/csrsrv/srv.h b/reactos/subsystems/csr/csrsrv/srv.h
index 3f59a486d28..48a9f0f1345 100644
--- a/reactos/subsystems/csr/csrsrv/srv.h
+++ b/reactos/subsystems/csr/csrsrv/srv.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef _SRV_H
+#define _SRV_H
 
 /* PSDK/NDK Headers */
 #define NTOS_MODE_USER
@@ -391,3 +392,4 @@ CsrThreadRefcountZero(IN PCSR_THREAD CsrThread);
 NTSTATUS
 NTAPI
 CsrSetDirectorySecurity(IN HANDLE ObjectDirectory);
+#endif