diff --git a/segmenttree.c b/segmenttree.c
index 449f8e7..418c78e 100644
--- a/segmenttree.c
+++ b/segmenttree.c
@@ -18,7 +18,7 @@ void build(sqlite3_stmt *stmt, int l, int r, int n) {
 /* Update value at index x*/
 void update(int x, int v, int l, int r, int n) {
 	if (l == r) {
-		seg[n] += v;
+		seg[n] = v;
 		return;
 	}
 	int m = l + r >> 1;