diff --git a/src/SDL_log.c b/src/SDL_log.c
index 7dfe1ebbc..9a5d1c480 100644
--- a/src/SDL_log.c
+++ b/src/SDL_log.c
@@ -376,7 +376,7 @@ SDL_LogOutput(void *userdata, int category, SDL_LogPriority priority,
 #if !defined(HAVE_STDIO_H) && !defined(__WINRT__)
         /* Screen output to stderr, if console was attached. */
         if (consoleAttached == 1) {
-                if (!WriteConsole(stderrHandle, tstr, lstrlen(tstr), &charsWritten, NULL)) {
+                if (!WriteConsole(stderrHandle, tstr, SDL_tcslen(tstr), &charsWritten, NULL)) {
                     OutputDebugString(TEXT("Error calling WriteConsole\r\n"));
                     if (GetLastError() == ERROR_NOT_ENOUGH_MEMORY) {
                         OutputDebugString(TEXT("Insufficient heap memory to write message\r\n"));
@@ -384,7 +384,7 @@ SDL_LogOutput(void *userdata, int category, SDL_LogPriority priority,
                 }
 
         } else if (consoleAttached == 2) {
-            if (!WriteFile(stderrHandle, output, lstrlenA(output), &charsWritten, NULL)) {
+            if (!WriteFile(stderrHandle, output, SDL_strlen(output), &charsWritten, NULL)) {
                 OutputDebugString(TEXT("Error calling WriteFile\r\n"));
             }
         }
diff --git a/src/audio/wasapi/SDL_wasapi.c b/src/audio/wasapi/SDL_wasapi.c
index 3f86c801b..e74f80c9c 100644
--- a/src/audio/wasapi/SDL_wasapi.c
+++ b/src/audio/wasapi/SDL_wasapi.c
@@ -58,42 +58,6 @@ static const IID SDL_IID_IAudioCaptureClient = { 0xc8adbd64, 0xe71e, 0x48a0,{ 0x
 static const GUID SDL_KSDATAFORMAT_SUBTYPE_PCM = { 0x00000001, 0x0000, 0x0010,{ 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 } };
 static const GUID SDL_KSDATAFORMAT_SUBTYPE_IEEE_FLOAT = { 0x00000003, 0x0000, 0x0010,{ 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 } };
 
-static SDL_bool
-WStrEqual(const WCHAR *a, const WCHAR *b)
-{
-    while (*a) {
-        if (*a != *b) {
-            return SDL_FALSE;
-        }
-        a++;
-        b++;
-    }
-    return *b == 0;
-}
-
-static size_t
-WStrLen(const WCHAR *wstr)
-{
-    size_t retval = 0;
-    if (wstr) {
-        while (*(wstr++)) {
-            retval++;
-        }
-    }
-    return retval;
-}
-
-static WCHAR *
-WStrDupe(const WCHAR *wstr)
-{
-    const size_t len = (WStrLen(wstr) + 1) * sizeof (WCHAR);
-    WCHAR *retval = (WCHAR *) SDL_malloc(len);
-    if (retval) {
-        SDL_memcpy(retval, wstr, len);
-    }
-    return retval;
-}
-
 
 void
 WASAPI_RemoveDevice(const SDL_bool iscapture, LPCWSTR devid)
@@ -103,7 +67,7 @@ WASAPI_RemoveDevice(const SDL_bool iscapture, LPCWSTR devid)
     DevIdList *prev = NULL;
     for (i = deviceid_list; i; i = next) {
         next = i->next;
-        if (WStrEqual(i->str, devid)) {
+        if (SDL_wcscmp(i->str, devid) == 0) {
             if (prev) {
                 prev->next = next;
             } else {
@@ -153,7 +117,7 @@ WASAPI_AddDevice(const SDL_bool iscapture, const char *devname, WAVEFORMATEXTENS
 
     /* see if we already have this one. */
     for (devidlist = deviceid_list; devidlist; devidlist = devidlist->next) {
-        if (WStrEqual(devidlist->str, devid)) {
+        if (SDL_wcscmp(devidlist->str, devid) == 0) {
             return;  /* we already have this. */
         }
     }
@@ -163,7 +127,7 @@ WASAPI_AddDevice(const SDL_bool iscapture, const char *devname, WAVEFORMATEXTENS
         return;  /* oh well. */
     }
 
-    devid = WStrDupe(devid);
+    devid = SDL_wcsdup(devid);
     if (!devid) {
         SDL_free(devidlist);
         return;  /* oh well. */
@@ -690,7 +654,7 @@ WASAPI_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
     if (!devid) {  /* is default device? */
         this->hidden->default_device_generation = SDL_AtomicGet(iscapture ? &WASAPI_DefaultCaptureGeneration : &WASAPI_DefaultPlaybackGeneration);
     } else {
-        this->hidden->devid = WStrDupe(devid);
+        this->hidden->devid = SDL_wcsdup(devid);
         if (!this->hidden->devid) {
             return SDL_OutOfMemory();
         }
diff --git a/src/core/windows/SDL_windows.h b/src/core/windows/SDL_windows.h
index 035538cd6..1d5e06b0d 100644
--- a/src/core/windows/SDL_windows.h
+++ b/src/core/windows/SDL_windows.h
@@ -46,10 +46,12 @@
 #if UNICODE
 #define WIN_StringToUTF8 WIN_StringToUTF8W
 #define WIN_UTF8ToString WIN_UTF8ToStringW
+#define SDL_tcslen SDL_wcslen
 #define SDL_tcsstr SDL_wcsstr
 #else
 #define WIN_StringToUTF8 WIN_StringToUTF8A
 #define WIN_UTF8ToString WIN_UTF8ToStringA
+#define SDL_tcslen SDL_strlen
 #define SDL_tcsstr SDL_strstr
 #endif
 
diff --git a/src/filesystem/windows/SDL_sysfilesystem.c b/src/filesystem/windows/SDL_sysfilesystem.c
index a1e2874fe..5e223d7cc 100644
--- a/src/filesystem/windows/SDL_sysfilesystem.c
+++ b/src/filesystem/windows/SDL_sysfilesystem.c
@@ -143,7 +143,7 @@ SDL_GetPrefPath(const char *org, const char *app)
         return NULL;
     }
 
-    new_wpath_len = lstrlenW(worg) + lstrlenW(wapp) + lstrlenW(path) + 3;
+    new_wpath_len = SDL_wcslen(worg) + SDL_wcslen(wapp) + SDL_wcslen(path) + 3;
 
     if ((new_wpath_len + 1) > MAX_PATH) {
         SDL_free(worg);
@@ -153,8 +153,8 @@ SDL_GetPrefPath(const char *org, const char *app)
     }
 
     if (*worg) {
-        lstrcatW(path, L"\\");
-        lstrcatW(path, worg);
+        SDL_wcslcat(path, L"\\", SDL_arraysize(path));
+        SDL_wcslcat(path, worg, SDL_arraysize(path));
     }
     SDL_free(worg);
 
@@ -167,8 +167,8 @@ SDL_GetPrefPath(const char *org, const char *app)
         }
     }
 
-    lstrcatW(path, L"\\");
-    lstrcatW(path, wapp);
+    SDL_wcslcat(path, L"\\", SDL_arraysize(path));
+    SDL_wcslcat(path, wapp, SDL_arraysize(path));
     SDL_free(wapp);
 
     api_result = CreateDirectoryW(path, NULL);
@@ -179,7 +179,7 @@ SDL_GetPrefPath(const char *org, const char *app)
         }
     }
 
-    lstrcatW(path, L"\\");
+    SDL_wcslcat(path, L"\\", SDL_arraysize(path));
 
     retval = WIN_StringToUTF8W(path);
 
diff --git a/src/video/winrt/SDL_winrtgamebar.cpp b/src/video/winrt/SDL_winrtgamebar.cpp
index 8c925b1ca..4d1acc1d6 100644
--- a/src/video/winrt/SDL_winrtgamebar.cpp
+++ b/src/video/winrt/SDL_winrtgamebar.cpp
@@ -89,7 +89,7 @@ WINRT_GetGameBar()
     IGameBarStatics_ *pGameBar = NULL;
     HRESULT hr;
 
-    hr = ::WindowsCreateString(wClassName, (UINT32)wcslen(wClassName), &hClassName);
+    hr = ::WindowsCreateString(wClassName, (UINT32)SDL_wcslen(wClassName), &hClassName);
     if (FAILED(hr)) {
         goto done;
     }
diff --git a/src/video/winrt/SDL_winrtvideo.cpp b/src/video/winrt/SDL_winrtvideo.cpp
index a731ecff6..322940aea 100644
--- a/src/video/winrt/SDL_winrtvideo.cpp
+++ b/src/video/winrt/SDL_winrtvideo.cpp
@@ -782,7 +782,7 @@ WINRT_CreateDisplayRequest(_THIS)
     ABI::Windows::System::Display::IDisplayRequest * pDisplayRequest = nullptr;
     HRESULT hr;
 
-    hr = ::WindowsCreateString(wClassName, (UINT32)wcslen(wClassName), &hClassName);
+    hr = ::WindowsCreateString(wClassName, (UINT32)SDL_wcslen(wClassName), &hClassName);
     if (FAILED(hr)) {
         goto done;
     }