diff --git a/safileio.c b/safileio.c
index 56452e7..2cf6149 100644
--- a/safileio.c
+++ b/safileio.c
@@ -122,7 +122,7 @@ void SASetupDefaultHooks(SAHooks *psHooks)
 
 #ifdef SHPAPI_WINDOWS
 
-const wchar_t *Utf8ToWideChar(const char *pszFilename)
+static wchar_t *Utf8ToWideChar(const char *pszFilename)
 {
     const int nMulti = strlen(pszFilename) + 1;
     const int nWide =