diff --git a/dlls/kernel32/locale.c b/dlls/kernel32/locale.c
index c1d89b74604..95978955c26 100644
--- a/dlls/kernel32/locale.c
+++ b/dlls/kernel32/locale.c
@@ -2985,6 +2985,10 @@ INT WINAPI CompareStringW(LCID lcid, DWORD flags,
 INT WINAPI CompareStringEx(LPCWSTR locale, DWORD flags, LPCWSTR str1, INT len1,
                            LPCWSTR str2, INT len2, LPNLSVERSIONINFO version, LPVOID reserved, LPARAM lParam)
 {
+    DWORD supported_flags = NORM_IGNORECASE|NORM_IGNORENONSPACE|NORM_IGNORESYMBOLS|SORT_STRINGSORT
+                           |NORM_IGNOREKANATYPE|NORM_IGNOREWIDTH|LOCALE_USE_CP_ACP;
+    DWORD semistub_flags = NORM_LINGUISTIC_CASING|0x10000000;
+    /* 0x10000000 is related to diacritics in Arabic, Japanese, and Hebrew */
     INT ret;
 
     if (version) FIXME("unexpected version parameter\n");
@@ -2997,16 +3001,14 @@ INT WINAPI CompareStringEx(LPCWSTR locale, DWORD flags, LPCWSTR str1, INT len1,
         return 0;
     }
 
-    if( flags & ~(NORM_IGNORECASE|NORM_IGNORENONSPACE|NORM_IGNORESYMBOLS|
-        SORT_STRINGSORT|NORM_IGNOREKANATYPE|NORM_IGNOREWIDTH|LOCALE_USE_CP_ACP|0x10000000) )
+    if (flags & ~(supported_flags|semistub_flags))
     {
         SetLastError(ERROR_INVALID_FLAGS);
         return 0;
     }
 
-    /* this style is related to diacritics in Arabic, Japanese, and Hebrew */
-    if (flags & 0x10000000)
-        WARN("Ignoring unknown flags 0x10000000\n");
+    if (flags & semistub_flags)
+        FIXME("semi-stub behavor for flag(s) 0x%x\n", flags & semistub_flags);
 
     if (len1 < 0) len1 = strlenW(str1);
     if (len2 < 0) len2 = strlenW(str2);
diff --git a/dlls/kernel32/tests/locale.c b/dlls/kernel32/tests/locale.c
index fc071a7d7b2..d3c77d0143d 100644
--- a/dlls/kernel32/tests/locale.c
+++ b/dlls/kernel32/tests/locale.c
@@ -1543,7 +1543,7 @@ static const struct comparestringex_test comparestringex_tests[] = {
     },
     { /* 13 */
       "tr-TR", NORM_LINGUISTIC_CASING,
-      {'i',0},   {0x130,0}, CSTR_LESS_THAN,    -1,                TRUE
+      {'i',0},   {0x130,0}, CSTR_LESS_THAN,    -1,                FALSE
     },
     { /* 14 */
       "tr-TR", NORM_LINGUISTIC_CASING,
@@ -1593,7 +1593,7 @@ static const struct comparestringex_test comparestringex_tests[] = {
     },
     { /* 25 */
       "tr-TR", NORM_LINGUISTIC_CASING | NORM_IGNORECASE,
-      {'i',0},   {0x130,0}, CSTR_EQUAL,        CSTR_LESS_THAN,    TRUE
+      {'i',0},   {0x130,0}, CSTR_EQUAL,        CSTR_LESS_THAN,    FALSE
     },
     { /* 26 */
       "tr-TR", NORM_LINGUISTIC_CASING | NORM_IGNORECASE,