diff --git a/compiler/extccomp.nim b/compiler/extccomp.nim
index 18a81ca967..5a1d33adea 100644
--- a/compiler/extccomp.nim
+++ b/compiler/extccomp.nim
@@ -969,7 +969,7 @@ proc writeJsonBuildInstructions*(conf: ConfigRef) =
 
   var buf = newStringOfCap(50)
 
-  let jsonFile = conf.nimcacheDir / RelativeFile(conf.projectName & ".json")
+  let jsonFile = conf.getNimcacheDir / RelativeFile(conf.projectName & ".json")
 
   var f: File
   if open(f, jsonFile.string, fmWrite):