diff --git a/include/psxtypes/arch/nt32/ntalltypes.h b/include/psxtypes/arch/nt32/ntalltypes.h
index af3e899..5e61552 100644
--- a/include/psxtypes/arch/nt32/ntalltypes.h
+++ b/include/psxtypes/arch/nt32/ntalltypes.h
@@ -176,10 +176,3 @@ typedef float			float_t;
 typedef double			double_t;
 #define __DEFINED_double_t
 #endif
-
-typedef __CUSTOM_OR_BUILTIN_va_list__ va_list;
-
-#define va_start(v,l)	__builtin_va_start(v,l)
-#define va_end(v)	__builtin_va_end(v)
-#define va_arg(v,l)	__builtin_va_arg(v,l)
-#define va_copy(d,s)	__builtin_va_copy(d,s)
diff --git a/include/psxtypes/arch/nt64/ntalltypes.h b/include/psxtypes/arch/nt64/ntalltypes.h
index 330b580..d6640f8 100644
--- a/include/psxtypes/arch/nt64/ntalltypes.h
+++ b/include/psxtypes/arch/nt64/ntalltypes.h
@@ -176,10 +176,3 @@ typedef float			float_t;
 typedef double			double_t;
 #define __DEFINED_double_t
 #endif
-
-typedef __CUSTOM_OR_BUILTIN_va_list__ va_list;
-
-#define va_start(v,l)	__builtin_va_start(v,l)
-#define va_end(v)	__builtin_va_end(v)
-#define va_arg(v,l)	__builtin_va_arg(v,l)
-#define va_copy(d,s)	__builtin_va_copy(d,s)
diff --git a/include/psxtypes/compiler/__nt_compiler_gcc.h b/include/psxtypes/compiler/__nt_compiler_gcc.h
index 5eb49a0..df81c64 100644
--- a/include/psxtypes/compiler/__nt_compiler_gcc.h
+++ b/include/psxtypes/compiler/__nt_compiler_gcc.h
@@ -38,11 +38,6 @@
 	#define __X86_64_MODEL 	__amd64
 #endif
 
-
-/* va_list */
-#define __CUSTOM_OR_BUILTIN_va_list__  __builtin_va_list
-
-
 /* compiler keywords */
 #define __in
 #define __out
@@ -132,4 +127,12 @@
 	#define __stdcall
 #endif
 
+/* vararg */
+typedef __builtin_va_list va_list;
+
+#define va_start(v,l)	__builtin_va_start(v,l)
+#define va_end(v)	__builtin_va_end(v)
+#define va_arg(v,l)	__builtin_va_arg(v,l)
+#define va_copy(d,s)	__builtin_va_copy(d,s)
+
 #endif /* _PSXTYPES_NT_COMPILER_GCC_H_ */
diff --git a/include/psxtypes/compiler/__nt_compiler_msvc.h b/include/psxtypes/compiler/__nt_compiler_msvc.h
index b441221..c865706 100644
--- a/include/psxtypes/compiler/__nt_compiler_msvc.h
+++ b/include/psxtypes/compiler/__nt_compiler_msvc.h
@@ -53,11 +53,6 @@
 	#define __X86_64_MODEL 	__amd64
 #endif
 
-
-/* va_list */
-#define __CUSTOM_OR_BUILTIN_va_list__  char *
-
-
 /* compiler keywords */
 #define __in
 #define __out
@@ -127,4 +122,20 @@
 #define NTAPI		__stdcall
 #define WINAPI		__stdcall
 
+/* vararg */
+typedef char *          va_list;
+
+#if defined(__NT32)
+void     __cdecl        __va_start(char ** ,...);
+#define __va_size(l)    (((sizeof(void *)-1) + sizeof(l)) & ~(sizeof(void *)-1))
+#define va_start(v,l)	((void)(v = (char *)((&(l)) + __va_size(l))))
+#define va_end(v)	((void)(v = 0))
+#endif
+
+#if defined(__NT64)
+void     __cdecl        __va_start(char ** ,...);
+#define va_start(v,l)	((void)(__va_start(&v, l)))
+#define va_end(v)	((void)(v = 0))
+#endif
+
 #endif /* _PSXTYPES_NT_COMPILER_MSVC_H_ */
diff --git a/include/psxtypes/compiler/__psx_compiler_gcc.h b/include/psxtypes/compiler/__psx_compiler_gcc.h
index 5995bf1..ee205f3 100644
--- a/include/psxtypes/compiler/__psx_compiler_gcc.h
+++ b/include/psxtypes/compiler/__psx_compiler_gcc.h
@@ -30,11 +30,6 @@
 	#define __X86_64_MODEL 	__amd64
 #endif
 
-
-/* va_list */
-#define __CUSTOM_OR_BUILTIN_va_list__  __builtin_va_list
-
-
 /* compiler keywords */
 #define __in
 #define __out
@@ -96,4 +91,12 @@
 #define NTAPI
 #define WINAPI
 
+/* vararg */
+typedef __builtin_va_list va_list;
+
+#define va_start(v,l)	__builtin_va_start(v,l)
+#define va_end(v)	__builtin_va_end(v)
+#define va_arg(v,l)	__builtin_va_arg(v,l)
+#define va_copy(d,s)	__builtin_va_copy(d,s)
+
 #endif /* _PSXTYPES_COMPILER_GCC_H_ */