diff --git a/net.c b/net.c
index b3b0a39..0774de3 100644
--- a/net.c
+++ b/net.c
@@ -751,8 +751,8 @@ game_state *make_move(game_state *state, int x, int y, int button)
     ty = y / TILE_SIZE;
     if (tx >= state->width || ty >= state->height)
 	return NULL;
-    if (tx % TILE_SIZE >= TILE_SIZE - TILE_BORDER ||
-	ty % TILE_SIZE >= TILE_SIZE - TILE_BORDER)
+    if (x % TILE_SIZE >= TILE_SIZE - TILE_BORDER ||
+	y % TILE_SIZE >= TILE_SIZE - TILE_BORDER)
 	return NULL;
 
     /*