diff --git a/clock.c b/clock.c
index 281adff..4a714eb 100644
--- a/clock.c
+++ b/clock.c
@@ -46,8 +46,8 @@
 struct freq_estimator {
 	tmv_t origin1;
 	tmv_t ingress1;
-	int max_count;
-	int count;
+	unsigned int max_count;
+	unsigned int count;
 };
 
 struct clock {
diff --git a/port.c b/port.c
index b06a648..1438808 100644
--- a/port.c
+++ b/port.c
@@ -43,8 +43,8 @@ struct nrate_estimator {
 	double ratio;
 	tmv_t origin1;
 	tmv_t ingress1;
-	int max_count;
-	int count;
+	unsigned int max_count;
+	unsigned int count;
 };
 
 struct port {