diff --git a/clock.c b/clock.c
index f5836fd..974b37c 100644
--- a/clock.c
+++ b/clock.c
@@ -55,7 +55,7 @@ struct clock_stats {
 	struct stats *offset;
 	struct stats *freq;
 	struct stats *delay;
-	int max_count;
+	unsigned int max_count;
 };
 
 struct clock {
diff --git a/phc2sys.c b/phc2sys.c
index 479bb83..582492d 100644
--- a/phc2sys.c
+++ b/phc2sys.c
@@ -159,7 +159,7 @@ struct clock {
 	struct stats *offset_stats;
 	struct stats *freq_stats;
 	struct stats *delay_stats;
-	int stats_max_count;
+	unsigned int stats_max_count;
 };
 
 static void update_clock_stats(struct clock *clock,