diff --git a/main.c b/main.c
index 09146da..5ecef5d 100644
--- a/main.c
+++ b/main.c
@@ -30,7 +30,7 @@
 struct bench_res {
 	double succ_rate;
 	double avg_time_us;
-	unsigned avg_passes;
+	double avg_passes;
 };
 
 static uint32_t getseed(void)
@@ -75,7 +75,7 @@ static void genpuzzles(struct sudoku puzzles_out[NPUZZLES],
 	}
 }
 
-static struct bench_res runbench(struct sudoku puzzles[NPUZZLES])
+static void runbench(struct sudoku puzzles[NPUZZLES], struct bench_res *res_out)
 {
 	int res[NPUZZLES];
 	unsigned i;
@@ -106,11 +106,9 @@ static struct bench_res runbench(struct sudoku puzzles[NPUZZLES])
 		tot_passes += (unsigned long)res[i];
 	}
 
-	return (struct bench_res) {
-		.succ_rate = (double)solved / NPUZZLES,
-		.avg_time_us = tot_micros / NPUZZLES,
-		.avg_passes = tot_passes / NPUZZLES,
-	};
+	res_out->succ_rate = (double)solved / NPUZZLES;
+	res_out->avg_time_us = tot_micros / NPUZZLES;
+	res_out->avg_passes = (double)tot_passes / NPUZZLES;
 }
 
 int main(void)
@@ -120,13 +118,14 @@ int main(void)
 	srand(seed);
 
 	struct sudoku puzzles[NPUZZLES];
+	struct bench_res res;
 	genpuzzles(puzzles, 0.33, true);
-	struct bench_res res = runbench(puzzles);
+	runbench(puzzles, &res);
 
 	puts("\n       SUMMARY\n       =======");
 	printf("Success rate: %.0lf%%\n", 1e2 * res.succ_rate);
 	printf("Average time: %.3lf µs\n", res.avg_time_us);
-	printf("Average n.o. passes: %u\n", res.avg_passes);
+	printf("Average n.o. passes: %0.3lf\n", res.avg_passes);
 
 	return 0;
 }