diff --git a/reactos/dll/win32/msvcrt/msvcrt.def b/reactos/dll/win32/msvcrt/msvcrt.def
index 659ba94564b..0fbe79ff9b4 100644
--- a/reactos/dll/win32/msvcrt/msvcrt.def
+++ b/reactos/dll/win32/msvcrt/msvcrt.def
@@ -529,6 +529,7 @@ _strset
 _strtime
 _strtoi64=stub
 _strtoui64=strtoull
+_strtoull=strtoull
 _strupr
 _swab
 _sys_errlist DATA