diff --git a/docker/nginx/conf.d/server/server.api b/docker/nginx/conf.d/server/server.api
index 7340eb72..5a131514 100644
--- a/docker/nginx/conf.d/server/server.api
+++ b/docker/nginx/conf.d/server/server.api
@@ -83,13 +83,13 @@ location /nginx/stats {
         local json = require('cjson')
         ngx.say(json.encode{
             -- current number of active client connections including waiting connections
-            connections_active = ngx.var.connections_active,
+            connections_active = tonumber(ngx.var.connections_active),
             -- current number of connections where nginx is reading the request header
-            connections_reading = ngx.var.connections_reading,
+            connections_reading = tonumber(ngx.var.connections_reading),
             -- current number of connections where nginx is writing the response back to the client
-            connections_writing = ngx.var.connections_writing,
+            connections_writing = tonumber(ngx.var.connections_writing),
             -- current number of idle client connections waiting for a request
-            connections_waiting = ngx.var.connections_waiting,
+            connections_waiting = tonumber(ngx.var.connections_waiting),
         })
         return ngx.exit(ngx.HTTP_OK)
     }