diff --git a/reactos/lib/msvcrt/msvcrt.def b/reactos/lib/msvcrt/msvcrt.def
index 32ed92f765b..2722614dcf8 100644
--- a/reactos/lib/msvcrt/msvcrt.def
+++ b/reactos/lib/msvcrt/msvcrt.def
@@ -1,4 +1,4 @@
-; $Id: msvcrt.def,v 1.25 2003/10/05 18:13:27 navaraf Exp $
+; $Id: msvcrt.def,v 1.26 2003/12/07 22:59:13 navaraf Exp $
 ;
 ; ReactOS MSVCRT Compatibility Library
 ;
@@ -258,7 +258,7 @@ _execve
 _execvp
 _execvpe
 _exit
-;_expand
+_expand
 _fcloseall
 _fcvt
 _fdopen
@@ -443,7 +443,7 @@ _memicmp
 _mkdir
 _mktemp
 ;_mktime64
-;_msize
+_msize
 _nextafter
 _onexit
 _open
diff --git a/reactos/lib/msvcrt/stdlib/malloc.c b/reactos/lib/msvcrt/stdlib/malloc.c
index 4a7085930b6..0c8a2e97eed 100644
--- a/reactos/lib/msvcrt/stdlib/malloc.c
+++ b/reactos/lib/msvcrt/stdlib/malloc.c
@@ -69,6 +69,22 @@ void* realloc(void* _ptr, size_t _size)
    return HeapReAlloc(hHeap, 0, _ptr, _size);
 }
 
+/*
+ * @implemented
+ */
+void* _expand(void* _ptr, size_t _size)
+{
+   return HeapReAlloc(GetProcessHeap(), HEAP_REALLOC_IN_PLACE_ONLY, _ptr, _size);
+}
+
+/*
+ * @implemented
+ */
+size_t _msize(void* _ptr)
+{
+   return HeapSize(GetProcessHeap(), 0, _ptr);
+}
+
 /* ?_set_new_mode@@YAHH@Z (MSVCRT.@) */
 int MSVCRT__set_new_mode(int mode)
 {