diff --git a/dlls/credui/credui_main.c b/dlls/credui/credui_main.c
index a4df9fe4330..bf9f7d186e4 100644
--- a/dlls/credui/credui_main.c
+++ b/dlls/credui/credui_main.c
@@ -206,7 +206,7 @@ static void CredDialogCreateBalloonTip(HWND hwndDlg, struct cred_dialog_params *
     SetWindowPos(params->hwndBalloonTip, HWND_TOPMOST, 0, 0, 0, 0,
                  SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
 
-    if (!LoadStringW(hinstCredUI, IDS_INCORRECTPASSWORD, wszText, sizeof(wszText)/sizeof(wszText[0])))
+    if (!LoadStringW(hinstCredUI, IDS_INCORRECTPASSWORD, wszText, ARRAY_SIZE(wszText)))
     {
         ERR("failed to load IDS_INCORRECTPASSWORD\n");
         return;
@@ -223,7 +223,7 @@ static void CredDialogCreateBalloonTip(HWND hwndDlg, struct cred_dialog_params *
     toolinfo.lpReserved = NULL;
     SendMessageW(params->hwndBalloonTip, TTM_ADDTOOLW, 0, (LPARAM)&toolinfo);
 
-    if (!LoadStringW(hinstCredUI, IDS_CAPSLOCKON, wszText, sizeof(wszText)/sizeof(wszText[0])))
+    if (!LoadStringW(hinstCredUI, IDS_CAPSLOCKON, wszText, ARRAY_SIZE(wszText)))
     {
         ERR("failed to load IDS_CAPSLOCKON\n");
         return;
@@ -251,7 +251,7 @@ static void CredDialogShowIncorrectPasswordBalloon(HWND hwndDlg, struct cred_dia
     if (params->fBalloonTipActive)
         return;
 
-    if (!LoadStringW(hinstCredUI, IDS_INCORRECTPASSWORDTITLE, wszTitle, sizeof(wszTitle)/sizeof(wszTitle[0])))
+    if (!LoadStringW(hinstCredUI, IDS_INCORRECTPASSWORDTITLE, wszTitle, ARRAY_SIZE(wszTitle)))
     {
         ERR("failed to load IDS_INCORRECTPASSWORDTITLE\n");
         return;
@@ -289,7 +289,7 @@ static void CredDialogShowCapsLockBalloon(HWND hwndDlg, struct cred_dialog_param
     if (params->fBalloonTipActive)
         return;
 
-    if (!LoadStringW(hinstCredUI, IDS_CAPSLOCKONTITLE, wszTitle, sizeof(wszTitle)/sizeof(wszTitle[0])))
+    if (!LoadStringW(hinstCredUI, IDS_CAPSLOCKONTITLE, wszTitle, ARRAY_SIZE(wszTitle)))
     {
         ERR("failed to load IDS_IDSCAPSLOCKONTITLE\n");
         return;
@@ -383,8 +383,8 @@ static BOOL CredDialogInit(HWND hwndDlg, struct cred_dialog_params *params)
     {
         WCHAR format[256];
         WCHAR message[256];
-        LoadStringW(hinstCredUI, IDS_MESSAGEFORMAT, format, sizeof(format)/sizeof(format[0]));
-        snprintfW(message, sizeof(message)/sizeof(message[0]), format, params->pszTargetName);
+        LoadStringW(hinstCredUI, IDS_MESSAGEFORMAT, format, ARRAY_SIZE(format));
+        snprintfW(message, ARRAY_SIZE(message), format, params->pszTargetName);
         SetDlgItemTextW(hwndDlg, IDC_MESSAGE, message);
     }
     SetWindowTextW(hwndUsername, params->pszUsername);
@@ -408,8 +408,8 @@ static BOOL CredDialogInit(HWND hwndDlg, struct cred_dialog_params *params)
     {
         WCHAR format[256];
         WCHAR title[256];
-        LoadStringW(hinstCredUI, IDS_TITLEFORMAT, format, sizeof(format)/sizeof(format[0]));
-        snprintfW(title, sizeof(title)/sizeof(title[0]), format, params->pszTargetName);
+        LoadStringW(hinstCredUI, IDS_TITLEFORMAT, format, ARRAY_SIZE(format));
+        snprintfW(title, ARRAY_SIZE(title), format, params->pszTargetName);
         SetWindowTextW(hwndDlg, title);
     }
 
@@ -867,8 +867,8 @@ ULONG SEC_ENTRY SspiPromptForCredentialsW( PCWSTR target, void *info,
     static const WCHAR negotiateW[] = {'N','e','g','o','t','i','a','t','e',0};
     WCHAR username[CREDUI_MAX_USERNAME_LENGTH + 1] = {0};
     WCHAR password[CREDUI_MAX_PASSWORD_LENGTH + 1] = {0};
-    DWORD len_username = sizeof(username) / sizeof(username[0]);
-    DWORD len_password = sizeof(password) / sizeof(password[0]);
+    DWORD len_username = ARRAY_SIZE(username);
+    DWORD len_password = ARRAY_SIZE(password);
     DWORD ret, flags;
     CREDUI_INFOW *cred_info = info;
     SEC_WINNT_AUTH_IDENTITY_W *id = input_id;