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diff --git a/source/common/wintz.cpp b/source/common/wintz.cpp
index 5e9ac0d2..8a143d9e 100644
--- a/source/common/wintz.cpp
+++ b/source/common/wintz.cpp
@@ -35,7 +35,7 @@
U_NAMESPACE_BEGIN
-// The value of MAX_TIMEZONE_ID_LENGTH is 128, which is defined in DYNAMIC_TIME_ZONE_INFORMATION
+// The max size of TimeZoneKeyName is 128, defined in DYNAMIC_TIME_ZONE_INFORMATION
#define MAX_TIMEZONE_ID_LENGTH 128
/**
@@ -44,7 +44,7 @@ U_NAMESPACE_BEGIN
* Note: We use the Win32 API GetDynamicTimeZoneInformation to get the current time zone info.
* This API returns a non-localized time zone name, which we can then map to an ICU time zone name.
*/
-U_CFUNC const char* U_EXPORT2
+U_INTERNAL const char* U_EXPORT2
uprv_detectWindowsTimeZone()
{
UErrorCode status = U_ZERO_ERROR;
@@ -79,7 +79,7 @@ uprv_detectWindowsTimeZone()
// convert from wchar_t* (UTF-16 on Windows) to char* (UTF-8).
u_strToUTF8(dynamicTZKeyName, UPRV_LENGTHOF(dynamicTZKeyName), nullptr,
- reinterpret_cast<const UChar*>(dynamicTZI.TimeZoneKeyName), UPRV_LENGTHOF(dynamicTZI.TimeZoneKeyName), &status);
+ reinterpret_cast<const UChar*>(dynamicTZI.TimeZoneKeyName), -1, &status);
if (U_FAILURE(status)) {
return nullptr;
diff --git a/source/common/wintz.h b/source/common/wintz.h
index f98b1779..cd8565ee 100644
--- a/source/common/wintz.h
+++ b/source/common/wintz.h
@@ -28,7 +28,7 @@ U_CDECL_BEGIN
typedef struct _TIME_ZONE_INFORMATION TIME_ZONE_INFORMATION;
U_CDECL_END
-U_CFUNC const char* U_EXPORT2
+U_INTERNAL const char* U_EXPORT2
uprv_detectWindowsTimeZone();
#endif /* U_PLATFORM_USES_ONLY_WIN32_API */
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