diff --git a/lib/io/dsv_io.cpp b/lib/io/dsv_io.cpp
index 1115f62..a8a7701 100644
--- a/lib/io/dsv_io.cpp
+++ b/lib/io/dsv_io.cpp
@@ -980,7 +980,7 @@ void gctl::geodsv_io::fill_column_point3dc(const array<point3dc> &data, int xid,
 
     std::stringstream ss;
     std::string s;
-    for (size_t i = 1; i < std::min(row_num_, (int) data.size()); i++)
+    for (size_t i = 1; i <= std::min(row_num_, (int) data.size()); i++)
     {
         ss.clear();
         ss << data[i - 1].x;
@@ -1016,7 +1016,7 @@ void gctl::geodsv_io::fill_column_point3ds(const array<point3ds> &data, int rid,
 
     std::stringstream ss;
     std::string s;
-    for (size_t i = 1; i < std::min(row_num_, (int) data.size()); i++)
+    for (size_t i = 1; i <= std::min(row_num_, (int) data.size()); i++)
     {
         ss.clear();
         ss << data[i - 1].rad;