diff --git a/sys/dev/mlx4/device.h b/sys/dev/mlx4/device.h
index 2095df7a700a..52fedc1844a2 100644
--- a/sys/dev/mlx4/device.h
+++ b/sys/dev/mlx4/device.h
@@ -1337,7 +1337,7 @@ int mlx4_get_roce_gid_from_slave(struct mlx4_dev *dev, int port, int slave_id, u
 
 int mlx4_FLOW_STEERING_IB_UC_QP_RANGE(struct mlx4_dev *dev, u32 min_range_qpn, u32 max_range_qpn);
 
-int mlx4_read_clock(struct mlx4_dev *dev);
+s64 mlx4_read_clock(struct mlx4_dev *dev);
 int mlx4_get_internal_clock_params(struct mlx4_dev *dev,
 				   struct mlx4_clock_params *params);
 
diff --git a/sys/dev/mlx4/mlx4_core/mlx4_main.c b/sys/dev/mlx4/mlx4_core/mlx4_main.c
index 3f452d37dbc5..bd2e19680059 100644
--- a/sys/dev/mlx4/mlx4_core/mlx4_main.c
+++ b/sys/dev/mlx4/mlx4_core/mlx4_main.c
@@ -1793,10 +1793,10 @@ static void unmap_bf_area(struct mlx4_dev *dev)
 		io_mapping_free(mlx4_priv(dev)->bf_mapping);
 }
 
-int mlx4_read_clock(struct mlx4_dev *dev)
+s64 mlx4_read_clock(struct mlx4_dev *dev)
 {
 	u32 clockhi, clocklo, clockhi1;
-	cycle_t cycles;
+	s64 cycles;
 	int i;
 	struct mlx4_priv *priv = mlx4_priv(dev);
 
@@ -1813,7 +1813,7 @@ int mlx4_read_clock(struct mlx4_dev *dev)
 
 	cycles = (u64) clockhi << 32 | (u64) clocklo;
 
-	return cycles;
+	return cycles & CORE_CLOCK_MASK;
 }
 EXPORT_SYMBOL_GPL(mlx4_read_clock);
 
diff --git a/sys/dev/mlx4/mlx4_ib/mlx4_ib_main.c b/sys/dev/mlx4/mlx4_ib/mlx4_ib_main.c
index 97dad9e449f6..4ceaa6d77b17 100644
--- a/sys/dev/mlx4/mlx4_ib/mlx4_ib_main.c
+++ b/sys/dev/mlx4/mlx4_ib/mlx4_ib_main.c
@@ -877,12 +877,12 @@ static int mlx4_ib_query_values(struct ib_device *device, int q_values,
 				struct ib_device_values *values)
 {
 	struct mlx4_ib_dev *dev = to_mdev(device);
-	cycle_t cycles;
+	s64 cycles;
 
 	values->values_mask = 0;
 	if (q_values & IBV_VALUES_HW_CLOCK) {
 		cycles = mlx4_read_clock(dev->dev);
-		if (cycles < 0) {
+		if (cycles >= 0) {
 			values->hwclock = cycles & CORE_CLOCK_MASK;
 			values->values_mask |= IBV_VALUES_HW_CLOCK;
 		}