diff --git a/reactos/lib/rossym_new/CMakeLists.txt b/reactos/lib/rossym_new/CMakeLists.txt
index 73387942ae8..0a63d5b3ca3 100644
--- a/reactos/lib/rossym_new/CMakeLists.txt
+++ b/reactos/lib/rossym_new/CMakeLists.txt
@@ -1,24 +1,25 @@
 
 if(MSVC)
-add_library(rossym dummy.c)
+    add_library(rossym dummy.c)
 else()
-add_definitions(-D_NTSYSTEM_)
-list(APPEND SOURCE
-    delete.c
-    dwarfabbrev.c
-    dwarfaranges.c
-    dwarfcfa.c
-    dwarfinfo.c
-    dwarfget.c
-    dwarfopen.c
-    dwarfpc.c
-    dwarfpubnames.c
-    find.c
-    fromfile.c
-    init.c
-    initum.c
-    pe.c
-    zwfile.c)
-add_library(rossym ${SOURCE})
-add_dependencies(rossym psdk bugcodes)
+    add_definitions(-D_NTSYSTEM_)
+    list(APPEND SOURCE
+        delete.c
+        dwarfabbrev.c
+        dwarfaranges.c
+        dwarfcfa.c
+        dwarfget.c
+        dwarfinfo.c
+        dwarfopen.c
+        dwarfpc.c
+        dwarfpubnames.c
+        find.c
+        fromfile.c
+        init.c
+        initum.c
+        pe.c
+        zwfile.c)
+    add_library(rossym ${SOURCE})
+    add_pch(rossym precomp.h)
+    add_dependencies(rossym psdk bugcodes)
 endif()
diff --git a/reactos/lib/rossym_new/delete.c b/reactos/lib/rossym_new/delete.c
index 1e6fe8393e2..314ff526f9e 100644
--- a/reactos/lib/rossym_new/delete.c
+++ b/reactos/lib/rossym_new/delete.c
@@ -7,17 +7,7 @@
  * PROGRAMMERS:     Ge van Geldorp (gvg@reactos.com)
  */
 
-#define NTOSAPI
-#include <ntddk.h>
-#include <reactos/rossym.h>
-#include <ntimage.h>
-
-#define NDEBUG
-#include <debug.h>
-
-#include "rossympriv.h"
-#include "pe.h"
-#include "dwarf.h"
+#include <precomp.h>
 
 VOID
 RosSymDelete(PROSSYM_INFO RosSymInfo)
diff --git a/reactos/lib/rossym_new/dwarfabbrev.c b/reactos/lib/rossym_new/dwarfabbrev.c
index a9d3c49b027..87621b69547 100644
--- a/reactos/lib/rossym_new/dwarfabbrev.c
+++ b/reactos/lib/rossym_new/dwarfabbrev.c
@@ -6,18 +6,9 @@
  * explicit reference counting if this turns out not to be acceptable.
  */
 
-#define NTOSAPI
-#include <ntddk.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
-#include <ntimage.h>
+#include <precomp.h>
 
 #define NDEBUG
-#include <debug.h>
-
-#include "rossym.h"
-#include "rossympriv.h"
-#include "dwarf.h"
 
 static int parseabbrevs(Dwarf*, ulong, DwarfAbbrev*, DwarfAttr*, int*, int*);
 DwarfAbbrev *dwarfgetabbrev(Dwarf*, ulong, ulong);
diff --git a/reactos/lib/rossym_new/dwarfaranges.c b/reactos/lib/rossym_new/dwarfaranges.c
index cda4cd6453f..6a70309b9b5 100644
--- a/reactos/lib/rossym_new/dwarfaranges.c
+++ b/reactos/lib/rossym_new/dwarfaranges.c
@@ -2,16 +2,9 @@
  * Dwarf address ranges parsing code.
  */
 
-#define NTOSAPI
-#include <ntddk.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
-#include <ntimage.h>
+#include <precomp.h>
 
 #define NDEBUG
-#include <debug.h>
-
-#include "dwarf.h"
 
 int
 dwarfaddrtounit(Dwarf *d, ulong addr, ulong *unit)
diff --git a/reactos/lib/rossym_new/dwarfcfa.c b/reactos/lib/rossym_new/dwarfcfa.c
index 3c0c349ef44..25292d467e0 100644
--- a/reactos/lib/rossym_new/dwarfcfa.c
+++ b/reactos/lib/rossym_new/dwarfcfa.c
@@ -8,17 +8,9 @@
  * the same encoding.
  */
 
-#define NTOSAPI
-#include <ntddk.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
-#include <ntimage.h>
+#include <precomp.h>
 
 #define NDEBUG
-#include <debug.h>
-
-#include "pe.h"
-#include "dwarf.h"
 
 #define trace 1
 
diff --git a/reactos/lib/rossym_new/dwarfget.c b/reactos/lib/rossym_new/dwarfget.c
index 7787163a21b..71714ad818c 100644
--- a/reactos/lib/rossym_new/dwarfget.c
+++ b/reactos/lib/rossym_new/dwarfget.c
@@ -2,17 +2,9 @@
  * Dwarf data format parsing routines.
  */
 
-#define NTOSAPI
-#include <ntddk.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
-#include <ntimage.h>
+#include <precomp.h>
 
 #define NDEBUG
-#include <debug.h>
-
-#include "dwarf.h"
-#include "pe.h"
 
 ulong
 dwarfget1(DwarfBuf *b)
diff --git a/reactos/lib/rossym_new/dwarfinfo.c b/reactos/lib/rossym_new/dwarfinfo.c
index 162282a7641..91342ed0128 100644
--- a/reactos/lib/rossym_new/dwarfinfo.c
+++ b/reactos/lib/rossym_new/dwarfinfo.c
@@ -2,19 +2,8 @@
  * Dwarf info parse and search.
  */
 
-#define NTOSAPI
-#include <ntifs.h>
-#include <ndk/ntndk.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
-#include <ntimage.h>
-
+#include <precomp.h>
 #define NDEBUG
-#include <debug.h>
-
-#include "dwarf.h"
-#include "pe.h"
-#include <windef.h>
 
 enum
 {
diff --git a/reactos/lib/rossym_new/dwarfopen.c b/reactos/lib/rossym_new/dwarfopen.c
index bcb0429ab40..602f50ab011 100644
--- a/reactos/lib/rossym_new/dwarfopen.c
+++ b/reactos/lib/rossym_new/dwarfopen.c
@@ -1,14 +1,6 @@
-#define NTOSAPI
-#include <ntddk.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
-#include <ntimage.h>
 
+#include <precomp.h>
 #define NDEBUG
-#include <debug.h>
-
-#include "dwarf.h"
-#include "pe.h"
 
 /* Adapted for PE */
 
diff --git a/reactos/lib/rossym_new/dwarfpc.c b/reactos/lib/rossym_new/dwarfpc.c
index ec41e10d16c..36b38ff887b 100644
--- a/reactos/lib/rossym_new/dwarfpc.c
+++ b/reactos/lib/rossym_new/dwarfpc.c
@@ -11,18 +11,9 @@
  * The encoding may be small, but it sure isn't simple!
  */
 
-#define NTOSAPI
-#include <ntddk.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
-#include <ntimage.h>
+#include <precomp.h>
 
 #define NDEBUG
-#include <debug.h>
-
-#include "dwarf.h"
-#include "pe.h"
-
 #define trace 0
 
 enum
diff --git a/reactos/lib/rossym_new/dwarfpubnames.c b/reactos/lib/rossym_new/dwarfpubnames.c
index 8a8d802b797..2a605d8f398 100644
--- a/reactos/lib/rossym_new/dwarfpubnames.c
+++ b/reactos/lib/rossym_new/dwarfpubnames.c
@@ -1,12 +1,6 @@
-#define NTOSAPI
-#include <ntddk.h>
-#include <reactos/rossym.h>
-#include <ntimage.h>
 
+#include <precomp.h>
 #define NDEBUG
-#include <debug.h>
-
-#include "dwarf.h"
 
 static int
 _dwarfnametounit(Dwarf *d, char *name, DwarfBlock *bl, DwarfSym *s)
diff --git a/reactos/lib/rossym_new/find.c b/reactos/lib/rossym_new/find.c
index beb6f170eea..89b64ff80d3 100644
--- a/reactos/lib/rossym_new/find.c
+++ b/reactos/lib/rossym_new/find.c
@@ -35,16 +35,9 @@
  * SUCH DAMAGE.
  */
 
-#include <ntddk.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
+#include <precomp.h>
 
 #define NDEBUG
-#include <debug.h>
-
-#include "rossym.h"
-#include "dwarf.h"
-#include "pe.h"
 
 BOOLEAN
 RosSymGetAddressInformation
diff --git a/reactos/lib/rossym_new/fromfile.c b/reactos/lib/rossym_new/fromfile.c
index a3ed16fd946..b157c817506 100644
--- a/reactos/lib/rossym_new/fromfile.c
+++ b/reactos/lib/rossym_new/fromfile.c
@@ -7,18 +7,7 @@
  * PROGRAMMERS:     Ge van Geldorp (gvg@reactos.com)
  */
 
-#define NTOSAPI
-#include <ntifs.h>
-#include <ndk/ntndk.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
-#include "pe.h"
-#include <ntimage.h>
-
-#include "dwarf.h"
-
-#define NDEBUG
-#include <debug.h>
+#include <precomp.h>
 
 #define SYMBOL_SIZE 18
 
diff --git a/reactos/lib/rossym_new/init.c b/reactos/lib/rossym_new/init.c
index 80be79a1ee0..d13fc09f0e4 100644
--- a/reactos/lib/rossym_new/init.c
+++ b/reactos/lib/rossym_new/init.c
@@ -7,9 +7,7 @@
  * PROGRAMMERS:     Ge van Geldorp (gvg@reactos.com)
  */
 
-#include <windows.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
+#include <precomp.h>
 
 ROSSYM_CALLBACKS RosSymCallbacks;
 
diff --git a/reactos/lib/rossym_new/initum.c b/reactos/lib/rossym_new/initum.c
index eb59c0f185e..0bc24694205 100644
--- a/reactos/lib/rossym_new/initum.c
+++ b/reactos/lib/rossym_new/initum.c
@@ -7,16 +7,7 @@
  * PROGRAMMERS:     Ge van Geldorp (gvg@reactos.com)
  */
 
-#define WIN32_NO_STATUS
-#include <windows.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
-#define NTOS_MODE_USER
-#include <ndk/ntndk.h>
-#include <pseh/pseh.h>
-
-#define NDEBUG
-#include <debug.h>
+#include <precomp.h>
 
 static PVOID
 RosSymAllocMemUM(ULONG_PTR Size)
diff --git a/reactos/lib/rossym_new/pe.c b/reactos/lib/rossym_new/pe.c
index 63fd9df6906..d5d4157aead 100644
--- a/reactos/lib/rossym_new/pe.c
+++ b/reactos/lib/rossym_new/pe.c
@@ -1,16 +1,6 @@
-#define NTOSAPI
-#include <ntifs.h>
-#include <ndk/ntndk.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
-#include <ntimage.h>
+#include <precomp.h>
 
 #define NDEBUG
-#include <debug.h>
-
-#include "dwarf.h"
-#include "pe.h"
-#include "rossympriv.h"
 
 PeSect *pesection(Pe *pe, const char *name) 
 {
diff --git a/reactos/lib/rossym_new/precomp.h b/reactos/lib/rossym_new/precomp.h
new file mode 100644
index 00000000000..610de3cd594
--- /dev/null
+++ b/reactos/lib/rossym_new/precomp.h
@@ -0,0 +1,12 @@
+#define NTOSAPI
+#include <ntifs.h>
+#include <ntimage.h>
+#include <ndk/psfuncs.h>
+#include <ndk/rtlfuncs.h>
+#include <reactos/rossym.h>
+
+#include "rossympriv.h"
+#include "pe.h"
+#include "dwarf.h"
+
+#include <debug.h>
diff --git a/reactos/lib/rossym_new/zwfile.c b/reactos/lib/rossym_new/zwfile.c
index a6ce196c632..99556e4e8cd 100644
--- a/reactos/lib/rossym_new/zwfile.c
+++ b/reactos/lib/rossym_new/zwfile.c
@@ -7,13 +7,7 @@
  * PROGRAMMERS:     Ge van Geldorp (gvg@reactos.com)
  */
 
-#define NTOSAPI
-#include <ntddk.h>
-#include <reactos/rossym.h>
-#include "rossympriv.h"
-
-#define NDEBUG
-#include <debug.h>
+#include <precomp.h>
 
 NTSTATUS RosSymStatus;