diff --git a/drivers/filesystems/fastfat_new/cachesup.c b/drivers/filesystems/fastfat_new/cachesup.c
index c3d5140d93d..7fcc3898597 100644
--- a/drivers/filesystems/fastfat_new/cachesup.c
+++ b/drivers/filesystems/fastfat_new/cachesup.c
@@ -1675,8 +1675,8 @@ FatZeroData (
     LARGE_INTEGER ZeroStart = {0,0};
     LARGE_INTEGER BeyondZeroEnd = {0,0};
 #else
-    LARGE_INTEGER ZeroStart = {.LowPart = 0, .HighPart = 0};
-    LARGE_INTEGER BeyondZeroEnd = {.LowPart = 0, .HighPart = 0};
+    LARGE_INTEGER ZeroStart = {{0,0}};
+    LARGE_INTEGER BeyondZeroEnd = {{0,0}};
 #endif
 
     ULONG SectorSize;
diff --git a/drivers/filesystems/fastfat_new/create.c b/drivers/filesystems/fastfat_new/create.c
index 19eca72131b..7210d362c0f 100644
--- a/drivers/filesystems/fastfat_new/create.c
+++ b/drivers/filesystems/fastfat_new/create.c
@@ -6448,7 +6448,7 @@ Return Value:
 #ifndef __REACTOS__
     LARGE_INTEGER AllocSize = {0};
 #else
-    LARGE_INTEGER AllocSize = {.LowPart = 0, .HighPart = 0};
+    LARGE_INTEGER AllocSize = {{0}};
 #endif
 
     //
diff --git a/drivers/filesystems/fastfat_new/dirsup.c b/drivers/filesystems/fastfat_new/dirsup.c
index 907c72997bb..b94f2c2fc28 100644
--- a/drivers/filesystems/fastfat_new/dirsup.c
+++ b/drivers/filesystems/fastfat_new/dirsup.c
@@ -2643,7 +2643,7 @@ Return Value:
 #ifndef __REACTOS__
     LARGE_INTEGER CurrentDay = {0};
 #else
-    LARGE_INTEGER CurrentDay = {.LowPart = 0, .HighPart = 0};
+    LARGE_INTEGER CurrentDay = {{0}};
 #endif
     LARGE_INTEGER LastAccessDay;
 
diff --git a/drivers/filesystems/fastfat_new/fatdata.c b/drivers/filesystems/fastfat_new/fatdata.c
index ddfeb1f1b19..0c92389d98e 100644
--- a/drivers/filesystems/fastfat_new/fatdata.c
+++ b/drivers/filesystems/fastfat_new/fatdata.c
@@ -62,8 +62,8 @@ PDEVICE_OBJECT FatCdromFileSystemDeviceObject;
 LARGE_INTEGER FatLargeZero = {0,0};
 LARGE_INTEGER FatMaxLarge = {MAXULONG,MAXLONG};
 #else
-LARGE_INTEGER FatLargeZero = {.LowPart = 0, .HighPart = 0};
-LARGE_INTEGER FatMaxLarge = {.LowPart = MAXULONG, .HighPart = MAXLONG};
+LARGE_INTEGER FatLargeZero = {{0,0}};
+LARGE_INTEGER FatMaxLarge = {{MAXULONG,MAXLONG}};
 #endif
 
 #ifndef __REACTOS__
@@ -73,11 +73,11 @@ LARGE_INTEGER FatOneDay = {0x2a69c000, 0xc9};
 LARGE_INTEGER FatJanOne1980 = {0xe1d58000,0x01a8e79f};
 LARGE_INTEGER FatDecThirtyOne1979 = {0xb76bc000,0x01a8e6d6};
 #else
-LARGE_INTEGER Fat30Milliseconds = {.LowPart = (ULONG)(-30 * 1000 * 10), .HighPart = -1};
-LARGE_INTEGER Fat100Milliseconds = {.LowPart = (ULONG)(-30 * 1000 * 10), .HighPart = -1};
-LARGE_INTEGER FatOneDay = {.LowPart = 0x2a69c000, .HighPart = 0xc9};
-LARGE_INTEGER FatJanOne1980 = {.LowPart = 0xe1d58000, .HighPart = 0x01a8e79f};
-LARGE_INTEGER FatDecThirtyOne1979 = {.LowPart = 0xb76bc000, .HighPart = 0x01a8e6d6};
+LARGE_INTEGER Fat30Milliseconds = {{(ULONG)(-30 * 1000 * 10), -1}};
+LARGE_INTEGER Fat100Milliseconds = {{(ULONG)(-30 * 1000 * 10), -1}};
+LARGE_INTEGER FatOneDay = {{0x2a69c000, 0xc9}};
+LARGE_INTEGER FatJanOne1980 = {{0xe1d58000,0x01a8e79f}};
+LARGE_INTEGER FatDecThirtyOne1979 = {{0xb76bc000,0x01a8e6d6}};
 #endif
 
 FAT_TIME_STAMP FatTimeJanOne1980 = {{0,0,0},{1,1,0}};
@@ -86,8 +86,8 @@ FAT_TIME_STAMP FatTimeJanOne1980 = {{0,0,0},{1,1,0}};
 LARGE_INTEGER FatMagic10000    = {0xe219652c, 0xd1b71758};
 LARGE_INTEGER FatMagic86400000 = {0xfa67b90e, 0xc6d750eb};
 #else
-LARGE_INTEGER FatMagic10000    = {.LowPart = 0xe219652c, .HighPart = 0xd1b71758};
-LARGE_INTEGER FatMagic86400000 = {.LowPart = 0xfa67b90e, .HighPart = 0xc6d750eb};
+LARGE_INTEGER FatMagic10000    = {{0xe219652c, 0xd1b71758}};
+LARGE_INTEGER FatMagic86400000 = {{0xfa67b90e, 0xc6d750eb}};
 #endif
 
 #ifdef _MSC_VER
diff --git a/drivers/filesystems/fastfat_new/fatinit.c b/drivers/filesystems/fastfat_new/fatinit.c
index c2189ca49a7..a752fbd2841 100644
--- a/drivers/filesystems/fastfat_new/fatinit.c
+++ b/drivers/filesystems/fastfat_new/fatinit.c
@@ -15,6 +15,10 @@ Abstract:
 
 #include "fatprocs.h"
 
+#ifdef __REACTOS__
+#define _Unreferenced_parameter_
+#endif
+
 DRIVER_INITIALIZE DriverEntry;
 
 NTSTATUS
@@ -28,11 +32,7 @@ _Function_class_(DRIVER_UNLOAD)
 VOID
 NTAPI
 FatUnload(
-#ifndef __REACTOS__
     _In_ _Unreferenced_parameter_ PDRIVER_OBJECT DriverObject
-#else
-    _In_ PDRIVER_OBJECT DriverObject
-#endif
     );
 
 NTSTATUS
@@ -462,11 +462,7 @@ _Function_class_(DRIVER_UNLOAD)
 VOID
 NTAPI
 FatUnload(
-#ifndef __REACTOS__
     _In_ _Unreferenced_parameter_ PDRIVER_OBJECT DriverObject
-#else
-    _In_ PDRIVER_OBJECT DriverObject
-#endif
     )
 
 /*++
diff --git a/drivers/filesystems/fastfat_new/fatstruc.h b/drivers/filesystems/fastfat_new/fatstruc.h
index a9fa08f4fec..edd1f283ca4 100644
--- a/drivers/filesystems/fastfat_new/fatstruc.h
+++ b/drivers/filesystems/fastfat_new/fatstruc.h
@@ -19,6 +19,9 @@ Abstract:
 
 typedef PVOID PBCB;     //**** Bcb's are now part of the cache module
 
+#ifdef __REACTOS__
+#define __volatile volatile
+#endif
 
 //
 //  The FAT_DATA record is the top record in the Fat file system in-memory
diff --git a/drivers/filesystems/fastfat_new/fileinfo.c b/drivers/filesystems/fastfat_new/fileinfo.c
index 15a3d3a33e9..f2a06205ef8 100644
--- a/drivers/filesystems/fastfat_new/fileinfo.c
+++ b/drivers/filesystems/fastfat_new/fileinfo.c
@@ -1962,7 +1962,7 @@ Return Value:
 #else
     FAT_TIME_STAMP LastWriteTime = {{0}};
     FAT_TIME_STAMP LastAccessTime = {{0}};
-    FAT_DATE LastAccessDate = {.Day = 0, .Month = 0, .Year = 0};
+    FAT_DATE LastAccessDate = {0, 0, 0};
 #endif
     UCHAR Attributes;