diff --git a/reactos/lib/crt/stdlib/malloc.c b/reactos/lib/crt/stdlib/malloc.c
index 44832f767b6..4dbad61cca5 100644
--- a/reactos/lib/crt/stdlib/malloc.c
+++ b/reactos/lib/crt/stdlib/malloc.c
@@ -36,12 +36,7 @@ extern HANDLE hHeap;
  */
 void* malloc(size_t _size)
 {
-   size_t nSize;
-     
-   if ( _size == 0)
-       return NULL;
-  
-   nSize = ROUND_SIZE(_size);
+   size_t nSize = ROUND_SIZE(_size);
    
    if (nSize<_size) 
        return NULL;     
@@ -65,7 +60,7 @@ void* calloc(size_t _nmemb, size_t _size)
    size_t nSize = _nmemb * _size;
    size_t cSize = ROUND_SIZE(nSize);
       
-   if ((_nmemb > ((size_t)-1 / _size)  || (nSize == 0) || (cSize<nSize)) 
+   if ((_nmemb > ((size_t)-1 / _size)  || (cSize<nSize)) 
       return NULL;
                
    return HeapAlloc(hHeap, HEAP_ZERO_MEMORY, cSize );
@@ -78,7 +73,7 @@ void* realloc(void* _ptr, size_t _size)
 {
    size_t nSize;
        
-   if ( _size == 0)
+   if (( _size == 0) && (_ptr !=NULL)
        return NULL;
    
    nSize = ROUND_SIZE(_size);
@@ -98,10 +93,7 @@ void* realloc(void* _ptr, size_t _size)
 void* _expand(void* _ptr, size_t _size)
 {
    size_t nSize;
-      
-   if ( _size == 0)
-       return NULL;
-
+         
    nSize = ROUND_SIZE(_size);
    
    if (nSize<_size)