diff --git a/lib/puma/plugin/statsd.rb b/lib/puma/plugin/statsd.rb
index 89e4905..a77db91 100644
--- a/lib/puma/plugin/statsd.rb
+++ b/lib/puma/plugin/statsd.rb
@@ -57,7 +57,7 @@ def old_workers
 
   def running
     if clustered?
-      @stats[:worker_status].map { |s| s[:last_status].fetch(:running, 0) }.inject(0, &:+)
+      @stats[:worker_status].sum(0) { |s| s[:last_status].fetch(:running, 0) }
     else
       @stats.fetch(:running, 0)
     end
@@ -65,7 +65,7 @@ def running
 
   def backlog
     if clustered?
-      @stats[:worker_status].map { |s| s[:last_status].fetch(:backlog, 0) }.inject(0, &:+)
+      @stats[:worker_status].sum(0) { |s| s[:last_status].fetch(:backlog, 0) }
     else
       @stats.fetch(:backlog, 0)
     end
@@ -73,7 +73,7 @@ def backlog
 
   def pool_capacity
     if clustered?
-      @stats[:worker_status].map { |s| s[:last_status].fetch(:pool_capacity, 0) }.inject(0, &:+)
+      @stats[:worker_status].sum(0) { |s| s[:last_status].fetch(:pool_capacity, 0) }
     else
       @stats.fetch(:pool_capacity, 0)
     end
@@ -81,7 +81,7 @@ def pool_capacity
 
   def max_threads
     if clustered?
-      @stats[:worker_status].map { |s| s[:last_status].fetch(:max_threads, 0) }.inject(0, &:+)
+      @stats[:worker_status].sum(0) { |s| s[:last_status].fetch(:max_threads, 0) }
     else
       @stats.fetch(:max_threads, 0)
     end
@@ -89,7 +89,7 @@ def max_threads
 
   def requests_count
     if clustered?
-      @stats[:worker_status].map { |s| s[:last_status].fetch(:requests_count, 0) }.inject(0, &:+)
+      @stats[:worker_status].sum(0) { |s| s[:last_status].fetch(:requests_count, 0) }
     else
       @stats.fetch(:requests_count, 0)
     end