diff --git a/src/blackinput/win/keyboardwindows.cpp b/src/blackinput/win/keyboardwindows.cpp
index f45df2c84..11776ff77 100644
--- a/src/blackinput/win/keyboardwindows.cpp
+++ b/src/blackinput/win/keyboardwindows.cpp
@@ -79,7 +79,7 @@ namespace BlackInput
     {
         Q_ASSERT_X(g_keyboardWindows == nullptr, "CKeyboardWindows::init", "Windows supports only one keyboard instance. Cannot initialize a second one!");
         g_keyboardWindows = this;
-        m_keyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, CKeyboardWindows::keyboardProc, GetModuleHandle(NULL), 0);
+        m_keyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, CKeyboardWindows::keyboardProc, GetModuleHandle(nullptr), 0);
         return true;
     }
 
diff --git a/src/blackmisc/processctrl.cpp b/src/blackmisc/processctrl.cpp
index 4c8816e54..d41c30501 100644
--- a/src/blackmisc/processctrl.cpp
+++ b/src/blackmisc/processctrl.cpp
@@ -48,7 +48,7 @@ namespace BlackMisc
         std::array<WCHAR, MAX_PATH> wszCommandLine = {{}};
         command.toWCharArray(wszCommandLine.data());
 
-        int result = CreateProcess (nullptr, wszCommandLine.data(), 0, 0, inherit, flags, nullptr, nullptr, &startupInfo, &processInfo);
+        int result = CreateProcess (nullptr, wszCommandLine.data(), nullptr, nullptr, inherit, flags, nullptr, nullptr, &startupInfo, &processInfo);
 
         if (result == 0)
         {
diff --git a/src/blackmisc/windllutils.cpp b/src/blackmisc/windllutils.cpp
index 67b10d500..17c868af8 100644
--- a/src/blackmisc/windllutils.cpp
+++ b/src/blackmisc/windllutils.cpp
@@ -32,8 +32,8 @@ namespace BlackMisc
         QString languageToIsoCode(LanguageCodePage codePage)
         {
             const LCID locale = codePage.wLanguage;
-            const int nchars = GetLocaleInfo(locale, LOCALE_SISO639LANGNAME, NULL, 0);
-            std::vector<wchar_t> language(nchars);
+            const int nchars = GetLocaleInfo(locale, LOCALE_SISO639LANGNAME, nullptr, 0);
+            std::vector<wchar_t> language(static_cast<size_t>(nchars));
             GetLocaleInfo(locale, LOCALE_SISO639LANGNAME, language.data(), nchars);
             const QString iso = QString::fromWCharArray(language.data(), nchars);
             return iso;
@@ -76,7 +76,7 @@ namespace BlackMisc
         VS_FIXEDFILEINFO *pFileInfo     = nullptr;
 
         // Get the version info for the file requested
-        dwSize = GetFileVersionInfoSize(pszFilePath, NULL);
+        dwSize = GetFileVersionInfoSize(pszFilePath, nullptr);
         if (dwSize == 0)
         {
             result.errorMsg = QString("Error in GetFileVersionInfoSize: %1\n").arg(GetLastError());