diff --git a/lib/fluent/plugin/in_kubernetes_metrics.rb b/lib/fluent/plugin/in_kubernetes_metrics.rb
index 1face14..261192c 100644
--- a/lib/fluent/plugin/in_kubernetes_metrics.rb
+++ b/lib/fluent/plugin/in_kubernetes_metrics.rb
@@ -315,7 +315,7 @@ def emit_cpu_metrics(tag:, metrics:, labels:)
         unless metrics['time'].nil?
           time = parse_time metrics['time']
           if usage_rate = metrics['usageNanoCores']
-            router.emit generate_tag("#{tag}.cpu.usage_rate"), time, labels.merge('value' => usage_rate / 1_000_000)
+            router.emit generate_tag("#{tag}.cpu.usage_rate"), time, labels.merge('value' => usage_rate / 1_000_000.0)
           end
           if usage = metrics['usageNanoCores']
             router.emit generate_tag("#{tag}.cpu.usage"), time, labels.merge('value' => usage)
@@ -416,13 +416,13 @@ def emit_stats_breakdown(stats)
 
       def emit_cpu_metrics_stats(tag:, metrics:, labels:, time:)
         if cpu_usage_total = metrics['usage']['total']
-          router.emit generate_tag("#{tag}.cpu.usage.total"), time, labels.merge('value' => cpu_usage_total / 1_000_000)
+          router.emit generate_tag("#{tag}.cpu.usage.total"), time, labels.merge('value' => cpu_usage_total / 1_000_000.0)
         end
         if cpu_usage_user = metrics['usage']['user']
-          router.emit generate_tag("#{tag}.cpu.usage.user"), time, labels.merge('value' => cpu_usage_user / 1_000_000)
+          router.emit generate_tag("#{tag}.cpu.usage.user"), time, labels.merge('value' => cpu_usage_user / 1_000_000.0)
         end
         if cpu_usage_system = metrics['usage']['system']
-          router.emit generate_tag("#{tag}.cpu.usage.system"), time, labels.merge('value' => cpu_usage_system / 1_000_000)
+          router.emit generate_tag("#{tag}.cpu.usage.system"), time, labels.merge('value' => cpu_usage_system / 1_000_000.0)
         end
 
         if cpu_cfs_periods = metrics['cfs']['periods']
diff --git a/test/plugin/test_in_kubernetes_metrics.rb b/test/plugin/test_in_kubernetes_metrics.rb
index 7ae81a2..cc99f96 100644
--- a/test/plugin/test_in_kubernetes_metrics.rb
+++ b/test/plugin/test_in_kubernetes_metrics.rb
@@ -115,7 +115,7 @@ def create_driver(conf = CONFIG)
       assert_equal @@parsed_unit_string['node']['cpu']['usageNanoCores'], @@hash_map_test['kube.node.cpu.usage'][2]['value']
 
       assert_not_nil @@hash_map_test.key?('kube.node.cpu.usage_rate')
-      assert_equal @@parsed_unit_string['node']['cpu']['usageNanoCores'] / 1_000_000, @@hash_map_test['kube.node.cpu.usage_rate'][2]['value']
+      assert_equal @@parsed_unit_string['node']['cpu']['usageNanoCores'] / 1_000_000.0, @@hash_map_test['kube.node.cpu.usage_rate'][2]['value']
     end
 
     test 'test_emit_memory_metrics' do