diff --git a/binding/c/ip2region.h b/binding/c/ip2region.h
index 2b560f6..bf7eac7 100644
--- a/binding/c/ip2region.h
+++ b/binding/c/ip2region.h
@@ -40,7 +40,6 @@
 typedef unsigned short ushort_t;
 typedef unsigned char uchar_t;
 typedef unsigned int uint_t;
-typedef unsigned int uint_t;
 typedef unsigned long ulong_t;
 
 #define INDEX_BLOCK_LENGTH 12