diff --git a/reactos/lib/sdk/libcntpr/string/wtol.c b/reactos/lib/sdk/libcntpr/string/wtol.c
index 33f5721b724..9944956384b 100644
--- a/reactos/lib/sdk/libcntpr/string/wtol.c
+++ b/reactos/lib/sdk/libcntpr/string/wtol.c
@@ -1,6 +1,8 @@
 #include <string.h>
-#include <stdlib.h>
-#include <windows.h>
+#include <ctype.h>
+#include <basetsd.h>
+
+/* Implementation comes from wine/dlls/ntdll/wcstring.c */
 
 /*
  * @implemented
@@ -8,23 +10,23 @@
 long
 _wtol(const wchar_t *str)
 {
-     ULONG RunningTotal = 0;
+    unsigned long RunningTotal = 0;
     char bMinus = 0;
 
     while (iswctype(*str, _SPACE) ) {
-	str++;
+        str++;
     } /* while */
 
     if (*str == L'+') {
-	str++;
+        str++;
     } else if (*str == L'-') {
-	bMinus = 1;
-	str++;
+        bMinus = 1;
+        str++;
     } /* if */
 
     while (*str >= L'0' && *str <= L'9') {
-	RunningTotal = RunningTotal * 10 + *str - L'0';
-	str++;
+        RunningTotal = RunningTotal * 10 + *str - L'0';
+        str++;
     } /* while */
 
     return bMinus ? -RunningTotal : RunningTotal;