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--- a/src/unac/unac.c
+++ b/src/unac/unac.c
@@ -12815,9 +12815,9 @@
     *out_lengthp = 0;
   } else {
     char* utf16 = 0;
-    int utf16_length = 0;
+    size_t utf16_length = 0;
     char* utf16_unaccented = 0;
-    int utf16_unaccented_length = 0;
+    size_t utf16_unaccented_length = 0;
   
     if(convert(charset, utf16be(), in, in_length, &utf16, &utf16_length) < 0) {
       return -1;