diff --git a/native/src/basechars.h b/native/src/basechars.h
index 5a44066..3843e11 100644
--- a/native/src/basechars.h
+++ b/native/src/basechars.h
@@ -1,3 +1,22 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_BASECHARS_H
+#define LATINIME_BASECHARS_H
+
 /**
  * Table mapping most combined Latin, Greek, and Cyrillic characters
  * to their base characters.  If c is in range, BASE_CHARS[c] == c
@@ -170,3 +189,4 @@
 
 // generated with:
 // cat UnicodeData.txt | perl -e 'while (<>) { @foo = split(/;/); $foo[5] =~ s/<.*> //; $base[hex($foo[0])] = hex($foo[5]);} for ($i = 0; $i < 0x500; $i += 8) { for ($j = $i; $j < $i + 8; $j++) { printf("0x%04x, ", $base[$j] ? $base[$j] : $j)}; print "\n"; }'
+#endif // LATINIME_BASECHARS_H