diff --git a/src/dll/fuse/fuse_opt.c b/src/dll/fuse/fuse_opt.c
index c65c914d..2940e185 100644
--- a/src/dll/fuse/fuse_opt.c
+++ b/src/dll/fuse/fuse_opt.c
@@ -107,7 +107,7 @@ static void fsp_fuse_opt_match_templ(
                 if ('%' == *p || '\0' == *p)
                     *pspec = p, *parg = q;
                 else
-                    *parg = 0 == lstrcmpA(q, p) ?
+                    *parg = 0 == invariant_strcmp(q, p) ?
                         fsp_fuse_opt_match_exact : fsp_fuse_opt_match_none;
             }
             else
diff --git a/src/dll/np.c b/src/dll/np.c
index 831ae580..bfaae0bf 100644
--- a/src/dll/np.c
+++ b/src/dll/np.c
@@ -252,7 +252,7 @@ static WCHAR FspNpGetDriveLetter(PDWORD PLogicalDrives, PWSTR VolumeName)
             LocalNameBuf[0] = Drive;
             if (QueryDosDeviceW(LocalNameBuf, VolumeNameBuf, sizeof VolumeNameBuf / sizeof(WCHAR)))
             {
-                if (0 == lstrcmpW(VolumeNameBuf, VolumeName))
+                if (0 == invariant_wcscmp(VolumeNameBuf, VolumeName))
                 {
                     *PLogicalDrives &= ~(1 << (Drive - 'A'));
                     return Drive;
@@ -432,7 +432,7 @@ DWORD APIENTRY NPGetConnection(
     {
         if (L'\0' == *P)
         {
-            if (0 == lstrcmpW(VolumeNameBuf, VolumeName))
+            if (0 == invariant_wcscmp(VolumeNameBuf, VolumeName))
             {
                 /*
                  * Looks like this is a WinFsp device. Extract the VolumePrefix from the VolumeName.
@@ -604,7 +604,7 @@ DWORD APIENTRY NPAddConnection(LPNETRESOURCEW lpNetResource, LPWSTR lpPassword,
             RemoteNameSize = sizeof RemoteNameBuf / sizeof(WCHAR);
             NpResult = NPGetConnection(LocalNameBuf, RemoteNameBuf, &RemoteNameSize);
             if (WN_SUCCESS == NpResult)
-                NpResult = 0 == lstrcmpW(ExpectRemoteNameBuf, RemoteNameBuf) ? WN_SUCCESS : WN_NO_NETWORK;
+                NpResult = 0 == invariant_wcscmp(ExpectRemoteNameBuf, RemoteNameBuf) ? WN_SUCCESS : WN_NO_NETWORK;
             else
                 NpResult = WN_NO_NETWORK;
         }
@@ -1036,9 +1036,7 @@ NTSTATUS FspNpRegister(VOID)
     {
         if (L',' == *P || '\0' == *P)
         {
-            if (CSTR_EQUAL == CompareStringW(LOCALE_INVARIANT, NORM_IGNORECASE,
-                Part, (int)(P - Part),
-                L"" FSP_NP_NAME, (int)(sizeof L"" FSP_NP_NAME - sizeof(WCHAR)) / sizeof(WCHAR)))
+            if (0 == invariant_wcsncmp(Part, L"" FSP_NP_NAME, P - Part))
             {
                 FoundProvider = TRUE;
                 break;
@@ -1099,9 +1097,7 @@ NTSTATUS FspNpUnregister(VOID)
     {
         if (L',' == *P || '\0' == *P)
         {
-            if (CSTR_EQUAL == CompareStringW(LOCALE_INVARIANT, NORM_IGNORECASE,
-                Part, (int)(P - Part),
-                L"" FSP_NP_NAME, (int)(sizeof L"" FSP_NP_NAME - sizeof(WCHAR)) / sizeof(WCHAR)))
+            if (0 == invariant_wcsncmp(Part, L"" FSP_NP_NAME, P - Part))
             {
                 FoundProvider = TRUE;
                 break;
diff --git a/src/launcher/launchctl.c b/src/launcher/launchctl.c
index ad74375a..6e4c5d71 100644
--- a/src/launcher/launchctl.c
+++ b/src/launcher/launchctl.c
@@ -227,7 +227,7 @@ int wmain(int argc, wchar_t **argv)
     if (0 == argc)
         usage();
 
-    if (0 == lstrcmpW(L"start", argv[0]))
+    if (0 == invariant_wcscmp(L"start", argv[0]))
     {
         if (3 > argc || argc > 12)
             usage();
@@ -236,7 +236,7 @@ int wmain(int argc, wchar_t **argv)
             FALSE);
     }
     else
-    if (0 == lstrcmpW(L"startWithSecret", argv[0]))
+    if (0 == invariant_wcscmp(L"startWithSecret", argv[0]))
     {
         if (4 > argc || argc > 13)
             usage();
@@ -245,7 +245,7 @@ int wmain(int argc, wchar_t **argv)
             TRUE);
     }
     else
-    if (0 == lstrcmpW(L"stop", argv[0]))
+    if (0 == invariant_wcscmp(L"stop", argv[0]))
     {
         if (3 != argc)
             usage();
@@ -253,7 +253,7 @@ int wmain(int argc, wchar_t **argv)
         return stop(PipeBuf, LAUNCHER_PIPE_BUFFER_SIZE, argv[1], argv[2]);
     }
     else
-    if (0 == lstrcmpW(L"info", argv[0]))
+    if (0 == invariant_wcscmp(L"info", argv[0]))
     {
         if (3 != argc)
             usage();
@@ -261,7 +261,7 @@ int wmain(int argc, wchar_t **argv)
         return getinfo(PipeBuf, LAUNCHER_PIPE_BUFFER_SIZE, argv[1], argv[2]);
     }
     else
-    if (0 == lstrcmpW(L"list", argv[0]))
+    if (0 == invariant_wcscmp(L"list", argv[0]))
     {
         if (1 != argc)
             usage();
@@ -269,7 +269,7 @@ int wmain(int argc, wchar_t **argv)
         return list(PipeBuf, LAUNCHER_PIPE_BUFFER_SIZE);
     }
     else
-    if (0 == lstrcmpW(L"quit", argv[0]))
+    if (0 == invariant_wcscmp(L"quit", argv[0]))
     {
         if (1 != argc)
             usage();
diff --git a/src/launcher/launcher.c b/src/launcher/launcher.c
index 6de0c4d3..90463797 100644
--- a/src/launcher/launcher.c
+++ b/src/launcher/launcher.c
@@ -157,8 +157,8 @@ static SVC_INSTANCE *SvcInstanceLookup(PWSTR ClassName, PWSTR InstanceName)
     {
         SvcInstance = CONTAINING_RECORD(ListEntry, SVC_INSTANCE, ListEntry);
 
-        if (0 == lstrcmpiW(ClassName, SvcInstance->ClassName) &&
-            0 == lstrcmpiW(InstanceName, SvcInstance->InstanceName))
+        if (0 == invariant_wcsicmp(ClassName, SvcInstance->ClassName) &&
+            0 == invariant_wcsicmp(InstanceName, SvcInstance->InstanceName))
             return SvcInstance;
     }
 
diff --git a/src/shared/minimal.h b/src/shared/minimal.h
index a0fddd52..03210906 100644
--- a/src/shared/minimal.h
+++ b/src/shared/minimal.h
@@ -87,6 +87,41 @@ void *memmove(void *dst, const void *src, size_t siz)
     return dst;
 }
 
+#define WINFSP_SHARED_MINIMAL_STRCMP(NAME, TYPE, CONV)\
+    static inline\
+    int NAME(const TYPE *s, const TYPE *t)\
+    {\
+        int v = 0;\
+        while (0 == (v = CONV(*s) - CONV(*t)) && *t)\
+            ++s, ++t;\
+        return v;/*(0 < v) - (0 > v);*/\
+    }
+#define WINFSP_SHARED_MINIMAL_STRNCMP(NAME, TYPE, CONV)\
+    static inline\
+    int NAME(const TYPE *s, const TYPE *t, size_t n)\
+    {\
+        int v = 0;\
+        const void *e = t + n;\
+        while (e > (const void *)t && 0 == (v = CONV(*s) - CONV(*t)) && *t)\
+            ++s, ++t;\
+        return v;/*(0 < v) - (0 > v);*/\
+    }
+static inline
+unsigned invariant_toupper(unsigned c)
+{
+    return ('a' <= c && c <= 'z') ? c & ~0x20 : c;
+}
+WINFSP_SHARED_MINIMAL_STRCMP(invariant_strcmp, char, (unsigned))
+WINFSP_SHARED_MINIMAL_STRCMP(invariant_stricmp, char, invariant_toupper)
+WINFSP_SHARED_MINIMAL_STRNCMP(invariant_strncmp, char, (unsigned))
+WINFSP_SHARED_MINIMAL_STRNCMP(invariant_strnicmp, char, invariant_toupper)
+WINFSP_SHARED_MINIMAL_STRCMP(invariant_wcscmp, wchar_t, (unsigned))
+WINFSP_SHARED_MINIMAL_STRCMP(invariant_wcsicmp, wchar_t, invariant_toupper)
+WINFSP_SHARED_MINIMAL_STRNCMP(invariant_wcsncmp, wchar_t, (unsigned))
+WINFSP_SHARED_MINIMAL_STRNCMP(invariant_wcsnicmp, wchar_t, invariant_toupper)
+#undef WINFSP_SHARED_MINIMAL_STRCMP
+#undef WINFSP_SHARED_MINIMAL_STRNCMP
+
 static inline void *MemAlloc(size_t Size)
 {
     return HeapAlloc(GetProcessHeap(), 0, Size);