diff --git a/reactos/dll/win32/dbghelp/stabs.c b/reactos/dll/win32/dbghelp/stabs.c
index b6b93b3201f..f3934d8222b 100644
--- a/reactos/dll/win32/dbghelp/stabs.c
+++ b/reactos/dll/win32/dbghelp/stabs.c
@@ -61,6 +61,8 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(dbghelp_stabs);
 
+UINT64 _strtoui64( const char *nptr, char **endptr, int base );
+
 #ifndef N_UNDF
 #define N_UNDF		0x00
 #endif
@@ -435,13 +437,13 @@ static int stabs_pts_read_range_value(struct ParseTypedefData* ptd, struct pts_r
         break;
     case '-':
         prv->sign = -1;
-        prv->val = strtoull(++ptd->ptr, &last, 10);
+        prv->val = _strtoui64(++ptd->ptr, &last, 10);
         ptd->ptr = last;
         break;
     case '+':
     default:    
         prv->sign = 1;
-        prv->val = strtoull(ptd->ptr, &last, 10);
+        prv->val = _strtoui64(ptd->ptr, &last, 10);
         ptd->ptr = last;
         break;
     }
diff --git a/reactos/dll/win32/msvcrt/msvcrt.def b/reactos/dll/win32/msvcrt/msvcrt.def
index 0fbe79ff9b4..8a53d6ef681 100644
--- a/reactos/dll/win32/msvcrt/msvcrt.def
+++ b/reactos/dll/win32/msvcrt/msvcrt.def
@@ -529,7 +529,6 @@ _strset
 _strtime
 _strtoi64=stub
 _strtoui64=strtoull
-_strtoull=strtoull
 _strupr
 _swab
 _sys_errlist DATA
@@ -798,7 +797,6 @@ strtod
 strtok
 strtol=NTDLL.strtol
 strtoul
-strtoull
 strxfrm
 swprintf=crt_swprintf
 swscanf