diff --git a/reactos/dll/win32/kernel32/mem/local.c b/reactos/dll/win32/kernel32/mem/local.c
index 1e9ce729c03..608ccd47bcf 100644
--- a/reactos/dll/win32/kernel32/mem/local.c
+++ b/reactos/dll/win32/kernel32/mem/local.c
@@ -255,7 +255,7 @@ NTAPI
 LocalLock(HLOCAL hMem)
 {
     /* This is the same as a GlobalLock, assuming these never change */
-    ASSERT(LMEM_LOCKCOUNT == GMEM_LOCKCOUNT);
+    C_ASSERT(LMEM_LOCKCOUNT == GMEM_LOCKCOUNT);
     return GlobalLock(hMem);
 }
 
diff --git a/reactos/dll/win32/kernel32/mem/section.c b/reactos/dll/win32/kernel32/mem/section.c
index 43ece5687cc..68c397c4359 100644
--- a/reactos/dll/win32/kernel32/mem/section.c
+++ b/reactos/dll/win32/kernel32/mem/section.c
@@ -353,16 +353,20 @@ OpenFileMappingW(DWORD dwDesiredAccess,
 BOOL
 NTAPI
 FlushViewOfFile(LPCVOID lpBaseAddress,
-                DWORD dwNumberOfBytesToFlush)
+                SIZE_T dwNumberOfBytesToFlush)
 {
+    SIZE_T NumberOfBytesToFlush;
     NTSTATUS Status;
-    ULONG NumberOfBytesFlushed;
+    IO_STATUS_BLOCK IoStatusBlock;
+
+    /* Save amount of bytes to flush to a local var */
+    NumberOfBytesToFlush = dwNumberOfBytesToFlush;
 
     /* Flush the view */
     Status = NtFlushVirtualMemory(NtCurrentProcess(),
                                   (LPVOID)lpBaseAddress,
-                                  dwNumberOfBytesToFlush,
-                                  &NumberOfBytesFlushed);
+                                  &NumberOfBytesToFlush,
+                                  &IoStatusBlock);
     if (!NT_SUCCESS(Status))
     {
         /* We failed */
diff --git a/reactos/include/psdk/winbase.h b/reactos/include/psdk/winbase.h
index ffb9d360078..4448fa66829 100644
--- a/reactos/include/psdk/winbase.h
+++ b/reactos/include/psdk/winbase.h
@@ -1398,7 +1398,7 @@ DWORD WINAPI GetFirmwareEnvironmentVariableW(LPCWSTR,LPCWSTR,PVOID,DWORD);
 #endif
 BOOL WINAPI FlushFileBuffers(HANDLE);
 BOOL WINAPI FlushInstructionCache(HANDLE,PCVOID,DWORD);
-BOOL WINAPI FlushViewOfFile(PCVOID,DWORD);
+BOOL WINAPI FlushViewOfFile(PCVOID,SIZE_T);
 DWORD WINAPI FlsAlloc(PFLS_CALLBACK_FUNCTION);
 PVOID WINAPI FlsGetValue(DWORD);
 BOOL WINAPI FlsSetValue(DWORD,PVOID);
diff --git a/reactos/include/psdk/winnt.h b/reactos/include/psdk/winnt.h
index 5e2eb4b13c0..05093d5c20b 100644
--- a/reactos/include/psdk/winnt.h
+++ b/reactos/include/psdk/winnt.h
@@ -238,6 +238,13 @@ typedef BYTE FCHAR;
 typedef WORD FSHORT;
 typedef DWORD FLONG;
 
+#define __C_ASSERT_JOIN(X, Y) __C_ASSERT_DO_JOIN(X, Y)
+#define __C_ASSERT_DO_JOIN(X, Y) __C_ASSERT_DO_JOIN2(X, Y)
+#define __C_ASSERT_DO_JOIN2(X, Y) X##Y
+
+#define C_ASSERT(e) typedef char __C_ASSERT_JOIN(__C_ASSERT__, __LINE__)[(e) ? 1 : -1]
+
+
 #ifdef __GNUC__
 #include "intrin.h"
 #endif
diff --git a/reactos/include/psdk/winternl.h b/reactos/include/psdk/winternl.h
index 037eb3b3c94..f58fc899dc0 100644
--- a/reactos/include/psdk/winternl.h
+++ b/reactos/include/psdk/winternl.h
@@ -1739,7 +1739,7 @@ NTSTATUS  WINAPI NtFindAtom(const WCHAR*,ULONG,RTL_ATOM*);
 NTSTATUS  WINAPI NtFlushBuffersFile(HANDLE,IO_STATUS_BLOCK*);
 NTSTATUS  WINAPI NtFlushInstructionCache(HANDLE,LPCVOID,SIZE_T);
 NTSTATUS  WINAPI NtFlushKey(HANDLE);
-NTSTATUS  WINAPI NtFlushVirtualMemory(HANDLE,LPCVOID*,SIZE_T*,ULONG);
+NTSTATUS  WINAPI NtFlushVirtualMemory(HANDLE,LPCVOID*,SIZE_T*,PIO_STATUS_BLOCK);
 NTSTATUS  WINAPI NtFlushWriteBuffer(VOID);
 NTSTATUS  WINAPI NtFreeVirtualMemory(HANDLE,PVOID*,SIZE_T*,ULONG);
 NTSTATUS  WINAPI NtFsControlFile(HANDLE,HANDLE,PIO_APC_ROUTINE,PVOID,PIO_STATUS_BLOCK,ULONG,PVOID,ULONG,PVOID,ULONG);