diff --git a/examples/NQueens.rp1 b/examples/NQueens.rp1
index 9d7bd0b..4c2109e 100644
--- a/examples/NQueens.rp1
+++ b/examples/NQueens.rp1
@@ -14,7 +14,7 @@ Queen(row, col) :- Coord row, Coord col.
 :- @count col : Queen(_, col) = 1.
 
 ; At most one queen can go along each main diagonal.
-:- @count diag : { Queen (row, col), diag = row + col } <= 1.
+:- @count diag : { Queen(row, col), diag = row + col } <= 1.
 
 ; At most one queen can go along each orthogonal diagonal.
-:- @count diag : { Queen (row, col), diag = row - col } <= 1.
+:- @count diag : { Queen(row, col), diag = row - col } <= 1.