diff --git a/coordinator/coordinator.lua b/coordinator/coordinator.lua
index 402827c..4df3ad1 100644
--- a/coordinator/coordinator.lua
+++ b/coordinator/coordinator.lua
@@ -113,6 +113,8 @@ function coordinator.load_config()
         mon_cfv.assert_eq(#config.UnitDisplays, config.UnitCount)
 
         if mon_cfv.valid() then
+            local w, h, _
+
             mon_cfv.assert(util.table_contains(names, config.MainDisplay))
 
             if not mon_cfv.valid() then return 2, "Main monitor is not connected." end
@@ -120,7 +122,7 @@ function coordinator.load_config()
             monitors.primary = ppm.get_periph(config.MainDisplay)
             monitors.primary_name = config.MainDisplay
 
-            local w, h = ppm.monitor_block_size(monitors.primary.getSize())
+            w, _ = ppm.monitor_block_size(monitors.primary.getSize())
             mon_cfv.assert(w == 8)
 
             if not mon_cfv.valid() then return 2, "Main monitor width is incorrect." end
@@ -133,7 +135,7 @@ function coordinator.load_config()
                 monitors.flow = ppm.get_periph(config.FlowDisplay)
                 monitors.flow_name = config.FlowDisplay
 
-                w, h = ppm.monitor_block_size(monitors.flow.getSize())
+                w, _ = ppm.monitor_block_size(monitors.flow.getSize())
                 mon_cfv.assert(w == 8)
 
                 if not mon_cfv.valid() then return 2, "Flow monitor width is incorrect." end
diff --git a/coordinator/renderer.lua b/coordinator/renderer.lua
index f9c793d..07282c4 100644
--- a/coordinator/renderer.lua
+++ b/coordinator/renderer.lua
@@ -3,8 +3,6 @@
 --
 
 local log        = require("scada-common.log")
-local util       = require("scada-common.util")
-local ppm        = require("scada-common.ppm")
 
 local iocontrol  = require("coordinator.iocontrol")
 
diff --git a/scada-common/ppm.lua b/scada-common/ppm.lua
index 37a2ecb..116264b 100644
--- a/scada-common/ppm.lua
+++ b/scada-common/ppm.lua
@@ -427,7 +427,7 @@ end
 ---@nodiscard
 ---@param w integer character width
 ---@param h integer character width
----@return integer block_width, integer block_height 
+---@return integer block_width, integer block_height
 function ppm.monitor_block_size(w, h)
     local width = math.floor((w - 15) / 21) + 1
     local height = math.floor((h - 10) / 14) + 1