diff --git a/src/core/PlayAreaSelector.ttslua b/src/core/PlayAreaSelector.ttslua
index e5958102..84749458 100644
--- a/src/core/PlayAreaSelector.ttslua
+++ b/src/core/PlayAreaSelector.ttslua
@@ -1,5 +1,5 @@
 local controlActive = false
-local playAreaAPI = require("core/PlayAreaApi")
+local playAreaApi = require("core/PlayAreaApi")
 
 -- parameters for open/close button for reusing
 local buttonParameters          = {}
@@ -62,11 +62,11 @@ end
 
 -- click function for apply button
 function click_applySurface(_, _, isRightClick)
-    playAreaAPI.updateSurface(isRightClick and "" or self.getInputs()[1].value)
+    playAreaApi.updateSurface(isRightClick and "" or self.getInputs()[1].value)
 end
 
 function updateSurface(newURL)
-    playAreaAPI.updateSurface(newURL)
+    playAreaApi.updateSurface(newURL)
 end
 
 -- input function for the input box