diff --git a/src/cfg/opt.c b/src/cfg/opt.c
index 6a1862f..95ec3a1 100644
--- a/src/cfg/opt.c
+++ b/src/cfg/opt.c
@@ -12,6 +12,11 @@ TargetConfig default_target_config() {
     config.print_ast = false;
     config.print_asm = false;
     config.print_ir = false;
+    config.mode = Application;
+    config.archive_directory = "archive";
+    config.archive_directory = "bin";
+    config.optimization_level = 1;
+    config.root_module = NULL;
 
     return config;
 }
diff --git a/src/cfg/opt.h b/src/cfg/opt.h
index cd00b62..c407523 100644
--- a/src/cfg/opt.h
+++ b/src/cfg/opt.h
@@ -19,6 +19,7 @@ typedef struct TargetConfig_t {
     bool print_asm;
     bool print_ir;
     // root module file which imports all submodules
+    // if this is NULL use the first commandline argument as root module
     char* root_module;
     // output directory for binaries
     char* output_directory;