diff --git a/dlls/msvcrt/msvcrt.h b/dlls/msvcrt/msvcrt.h
index cf3c53180e2..587d9e8c51d 100644
--- a/dlls/msvcrt/msvcrt.h
+++ b/dlls/msvcrt/msvcrt.h
@@ -71,7 +71,7 @@ typedef void (*MSVCRT__beginthread_start_routine_t)(void *);
 typedef unsigned int (__stdcall *MSVCRT__beginthreadex_start_routine_t)(void *);
 typedef int (*MSVCRT__onexit_t)(void);
 
-typedef struct {long double x;} _LDOUBLE;
+typedef struct {long double x;} MSVCRT__LDOUBLE;
 
 struct MSVCRT_tm {
     int tm_sec;
diff --git a/dlls/msvcrt/string.c b/dlls/msvcrt/string.c
index d1973a34d84..ffacc35a1ae 100644
--- a/dlls/msvcrt/string.c
+++ b/dlls/msvcrt/string.c
@@ -174,7 +174,7 @@ int CDECL MSVCRT__stricoll( const char* str1, const char* str2 )
 /********************************************************************
  *		_atoldbl (MSVCRT.@)
  */
-int CDECL MSVCRT__atoldbl(_LDOUBLE * value, char * str)
+int CDECL MSVCRT__atoldbl(MSVCRT__LDOUBLE * value, char * str)
 {
   /* FIXME needs error checking for huge/small values */
 #ifdef HAVE_STRTOLD
diff --git a/include/msvcrt/stdlib.h b/include/msvcrt/stdlib.h
index 269f2799bad..ddaae617f50 100644
--- a/include/msvcrt/stdlib.h
+++ b/include/msvcrt/stdlib.h
@@ -28,6 +28,22 @@ typedef unsigned short wchar_t;
 #endif
 #endif
 
+
+typedef struct
+{
+    float f;
+} _CRT_FLOAT;
+
+typedef struct
+{
+    double x;
+} _CRT_DOUBLE;
+
+typedef struct
+{
+    unsigned char ld[10];
+} _LDOUBLE;
+
 #if defined(__x86_64__) && !defined(_WIN64)
 #define _WIN64
 #endif
@@ -128,8 +144,11 @@ extern int*           _errno(void);
 typedef int (*_onexit_t)(void);
 
 
+int         _atodbl(_CRT_DOUBLE*,char*);
+int         _atoflt(_CRT_FLOAT*,char*);
 __int64     _atoi64(const char*);
 long double _atold(const char*);
+int         _atoldbl(_LDOUBLE*,char*);
 void        _beep(unsigned int,unsigned int);
 char*       _ecvt(double,int,int*,int*);
 char*       _fcvt(double,int,int*,int*);