diff --git a/Contrib/AdvSplash/advsplash.c b/Contrib/AdvSplash/advsplash.c
index c222fca0..d523cde6 100644
--- a/Contrib/AdvSplash/advsplash.c
+++ b/Contrib/AdvSplash/advsplash.c
@@ -169,8 +169,6 @@ void CALLBACK TimeProc(UINT uID,
   timeleft--;
 }
 
-int myatoi(char *s);
-
 void __declspec(dllexport) show(HWND hwndParent, int string_size,
                                 char *variables, stack_t ** stacktop)
 {
@@ -288,51 +286,3 @@ void __declspec(dllexport) show(HWND hwndParent, int string_size,
   wsprintf(temp, "%d", g_rv);
   pushstring(temp);
 }
-
-int myatoi(char *s)
-{
-  unsigned int v = 0;
-  if (*s == '0' && (s[1] == 'x' || s[1] == 'X')) {
-    s += 2;
-    for (;;) {
-      int c = *s++;
-      if (c >= '0' && c <= '9')
-        c -= '0';
-      else if (c >= 'a' && c <= 'f')
-        c -= 'a' - 10;
-      else if (c >= 'A' && c <= 'F')
-        c -= 'A' - 10;
-      else
-        break;
-      v <<= 4;
-      v += c;
-    }
-  } else if (*s == '0' && s[1] <= '7' && s[1] >= '0') {
-    s++;
-    for (;;) {
-      int c = *s++;
-      if (c >= '0' && c <= '7')
-        c -= '0';
-      else
-        break;
-      v <<= 3;
-      v += c;
-    }
-  } else {
-    int sign = 0;
-    if (*s == '-') {
-      s++;
-      sign++;
-    }
-    for (;;) {
-      int c = *s++ - '0';
-      if (c < 0 || c > 9)
-        break;
-      v *= 10;
-      v += c;
-    }
-    if (sign)
-      return -(int) v;
-  }
-  return (int) v;
-}
diff --git a/Contrib/Banner/Banner.c b/Contrib/Banner/Banner.c
index 02ca6764..2c2cefd7 100644
--- a/Contrib/Banner/Banner.c
+++ b/Contrib/Banner/Banner.c
@@ -19,8 +19,6 @@ BOOL bFailed;
 
 char buf[1024];
 
-unsigned int myatoi(char *s);
-
 BOOL CALLBACK BannerProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
 {
   if (uMsg == WM_INITDIALOG)
@@ -32,7 +30,7 @@ BOOL CALLBACK BannerProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
     {
       unsigned int id;
       popstring(buf);
-      id = myatoi(buf);
+      id = myatou(buf);
       popstring(buf);
       SetDlgItemText(hwndDlg, id, buf);
       popstring(buf);
@@ -167,18 +165,3 @@ BOOL WINAPI DllMain(HANDLE hInst, ULONG ul_reason_for_call, LPVOID lpReserved)
   }
   return TRUE;
 }
-
-unsigned int myatoi(char *s)
-{
-  unsigned int v=0;
-
-  for (;;)
-  {
-    unsigned int c=*s++;
-    if (c >= '0' && c <= '9') c-='0';
-    else break;
-    v*=10;
-    v+=c;
-  }
-  return v;
-}
diff --git a/Contrib/BgImage/BgImage.cpp b/Contrib/BgImage/BgImage.cpp
index 6fd591a5..da05c3fa 100644
--- a/Contrib/BgImage/BgImage.cpp
+++ b/Contrib/BgImage/BgImage.cpp
@@ -58,7 +58,6 @@ unsigned int uWndWidth, uWndHeight;
 void *oldProc;
 LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
 HBITMAP __stdcall LoadBitmapFile(long right, long bottom, BITMAP *bBitmap);
-int __stdcall myatoi(char *s);
 COLORREF GetColor();
 void __stdcall GetXY(LPPOINT lpPoint);
 
@@ -594,51 +593,6 @@ void __stdcall GetXY(LPPOINT lpPoint) {
   lpPoint->y = (unsigned int)iPosTemp;
 }
 
-int __stdcall myatoi(char *s)
-{
-  unsigned int v=0;
-  if (*s == '0' && (s[1] == 'x' || s[1] == 'X'))
-  {
-    s+=2;
-    for (;;)
-    {
-      int c=*s++;
-      if (c >= '0' && c <= '9') c-='0';
-      else if (c >= 'a' && c <= 'f') c-='a'-10;
-      else if (c >= 'A' && c <= 'F') c-='A'-10;
-      else break;
-      v<<=4;
-      v+=c;
-    }
-  }
-  else if (*s == '0' && s[1] <= '7' && s[1] >= '0')
-  {
-    s++;
-    for (;;)
-    {
-      int c=*s++;
-      if (c >= '0' && c <= '7') c-='0';
-      else break;
-      v<<=3;
-      v+=c;
-    }
-  }
-  else
-  {
-    int sign=0;
-    if (*s == '-') { s++; sign++; }
-    for (;;)
-    {
-      int c=*s++ - '0';
-      if (c < 0 || c > 9) break;
-      v*=10;
-      v+=c;
-    }
-    if (sign) return -(int) v;
-  }
-  return (int)v;
-}
-
 extern "C" BOOL WINAPI DllMain(HINSTANCE hInst, ULONG ul_reason_for_call, LPVOID lpReserved) {
   g_hInstance=hInst;
   switch (ul_reason_for_call) {
diff --git a/Contrib/LangDLL/LangDLL.c b/Contrib/LangDLL/LangDLL.c
index a7366961..c34a24c7 100644
--- a/Contrib/LangDLL/LangDLL.c
+++ b/Contrib/LangDLL/LangDLL.c
@@ -12,8 +12,6 @@
 
 #include <plugin.h> // nsis plugin.h
 
-int myatoi(char *s);
-
 HINSTANCE g_hInstance;
 HWND g_hwndParent;
 
@@ -61,7 +59,7 @@ BOOL CALLBACK DialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
       SendDlgItemMessage(hwndDlg, IDC_APPICON, STM_SETICON, (LPARAM)LoadIcon(GetModuleHandle(0),MAKEINTRESOURCE(103)), 0);
       // set font
       if (dofont && !popstring(temp)) {
-        size = myatoi(temp);
+        size = myatou(temp);
         if (!popstring(temp)) {
           LOGFONT f = {0,};
           if (lstrcmp(temp, "MS Shell Dlg")) {
@@ -159,7 +157,7 @@ void __declspec(dllexport) LangDialog(HWND hwndParent, int string_size,
       pop_empty_string = TRUE;
     } else {
       // use counts languages
-      langs_num = myatoi(temp);
+      langs_num = myatou(temp);
     }
 
     // zero languages?
@@ -187,7 +185,7 @@ void __declspec(dllexport) LangDialog(HWND hwndParent, int string_size,
       if (docp)
       {
         if (popstring(temp)) { visible_langs_num = 0; break; }
-        langs[visible_langs_num].cp = myatoi(temp);
+        langs[visible_langs_num].cp = myatou(temp);
       }
 
       if (!docp || langs[visible_langs_num].cp == GetACP() || langs[visible_langs_num].cp == 0)
@@ -236,15 +234,3 @@ BOOL WINAPI DllMain(HANDLE hInst, ULONG ul_reason_for_call, LPVOID lpReserved)
   g_hInstance=hInst;
 	return TRUE;
 }
-
-int myatoi(char *s)
-{
-  unsigned int v=0;
-  for (;;) {
-    int c=*s++ - '0';
-    if (c < 0 || c > 9) break;
-    v*=10;
-    v+=c;
-  }
-  return (int)v;
-}