Re-add prefix to private function.
diff --git a/lib/zip_filerange_crc.c b/lib/zip_filerange_crc.c
index 5702aa8..8e06e8f 100644
--- a/lib/zip_filerange_crc.c
+++ b/lib/zip_filerange_crc.c
@@ -53,14 +53,14 @@
     }
 
     if (zip_source_seek(src, (zip_int64_t)start, SEEK_SET) != 0) {
-	zip_error_set_from_source(error, src);
+	_zip_error_set_from_source(error, src);
 	return -1;
     }
     
     while (len > 0) {
 	n = (zip_int64_t)(len > BUFSIZE ? BUFSIZE : len);
 	if ((n = zip_source_read(src, buf, (zip_uint64_t)n)) < 0) {
-	    zip_error_set_from_source(error, src);
+	    _zip_error_set_from_source(error, src);
 	    return -1;
 	}
 	if (n == 0) {