diff --git a/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java b/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
index fcdec4c98f2d3794a73707fdc3ceff448bdb8dc3..3f834c712d4296ae20854d43ccd679ed5642df79 100644
--- a/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
+++ b/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
@@ -175,7 +175,7 @@ public class Searcher {
 
     public static byte[] loadVectorIndex(RandomAccessFile handle) throws IOException {
         handle.seek(HeaderInfoLength);
-        int len = VectorIndexRows * VectorIndexCols * SegmentIndexSize;
+        int len = VectorIndexRows * VectorIndexCols * VectorIndexSize;
         final byte[] buff = new byte[len];
         int rLen = handle.read(buff);
         if (rLen != len) {