diff --git a/BuildTools/BuildTarget.lua b/BuildTools/BuildTarget.lua
index a870e94a6..98e1a2d25 100644
--- a/BuildTools/BuildTarget.lua
+++ b/BuildTools/BuildTarget.lua
@@ -176,7 +176,7 @@ function BuildTarget:ProcessLuaSources()
 
 	for index, luaSourceFilePath in ipairs(self.luaSources) do
 		local outputFile =
-			string.format("%s/%s.%s", self.BUILD_DIR, luaSourceFilePath, NinjaBuildTools.OBJECT_FILE_EXTENSION)
+			string.format("%s/%s.%s", self.BUILD_DIR, luaSourceFilePath, ".cpp")
 		ninjaFile:AddBuildEdge(outputFile, "bcsave " .. luaSourceFilePath)
 		table.insert(objectFiles, outputFile)
 	end