diff --git a/ets2panda/checker/ETSchecker.cpp b/ets2panda/checker/ETSchecker.cpp
index d5290ab601f9156a87ba0d3224b95f8fc1a351b1..c4f642509f9c88a544a09c92043e0721e00f7dee 100644
--- a/ets2panda/checker/ETSchecker.cpp
+++ b/ets2panda/checker/ETSchecker.cpp
@@ -368,12 +368,14 @@ void ETSChecker::SetDebugInfoPlugin(evaluate::ScopedDebugInfoPlugin *debugInfo)
 
 void ETSChecker::CheckProgram(parser::Program *program, bool runAnalysis)
 {
+    static std::ofstream out("1.2sourceFilePath.txt", std::ios::app);
     auto *savedProgram = Program();
     SetProgram(program);
 
     for (auto &[_, extPrograms] : program->ExternalSources()) {
         (void)_;
         for (auto *extProg : extPrograms) {
+            out << extProg->SourceFilePath() << '\n';
             if (!extProg->IsASTLowered()) {
                 extProg->PushChecker(this);
                 auto *savedProgram2 = VarBinder()->AsETSBinder()->Program();