diff --git a/kong/api/routes/kong.lua b/kong/api/routes/kong.lua
index 966c376329b2..11a5dce5ac51 100644
--- a/kong/api/routes/kong.lua
+++ b/kong/api/routes/kong.lua
@@ -93,9 +93,15 @@ return {
 
       local available_plugins = {}
       for name in pairs(singletons.configuration.loaded_plugins) do
+        local pr = kong.db.plugins.handlers[name].PRIORITY
+        if pr ~= nil then
+          if type(pr) ~= "number" or math.abs(pr) == math.huge then
+            pr = tostring(pr)
+          end
+        end
         available_plugins[name] = {
           version = kong.db.plugins.handlers[name].VERSION,
-          priority = kong.db.plugins.handlers[name].PRIORITY,
+          priority = pr,
         }
       end