diff --git a/game/main.c b/game/main.c
index c94c25e..bc066b3 100644
--- a/game/main.c
+++ b/game/main.c
@@ -144,8 +144,8 @@ static inline double dot(dvec_t v, dvec_t u)
 static inline unsigned
 tileat(const map_t map, int layeridx, double x, double y)
 {
-	const unsigned row = (unsigned)floor(x / TILESIZE) + MAPSHIFTX;
-	const unsigned col = (unsigned)floor(y / TILESIZE) + MAPSHIFTY;
+	const unsigned row = (unsigned)(floor(x / TILESIZE) + MAPSHIFTX);
+	const unsigned col = (unsigned)(floor(y / TILESIZE) + MAPSHIFTY);
 	if (row >= MAPWIDTH || col >= MAPHEIGHT)
 		return 0;
 	else