@@ -1098,11 +1098,11 @@
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 extern size_t of_string_utf8_encode(of_unichar_t, char*);
-extern size_t of_string_utf8_decode(const char*, size_t, of_unichar_t*);
+extern ssize_t of_string_utf8_decode(const char*, size_t, of_unichar_t*);
 extern size_t of_string_utf16_length(const of_char16_t*);
 extern size_t of_string_utf32_length(const of_char32_t*);
 #ifdef __cplusplus
 }
 #endif