diff --git a/td/generate/remove_documentation.cpp b/td/generate/remove_documentation.cpp
index 435a90556..7e4651414 100644
--- a/td/generate/remove_documentation.cpp
+++ b/td/generate/remove_documentation.cpp
@@ -13,9 +13,9 @@
 int main(int argc, char *argv[]) {
   for (int i = 1; i < argc; i++) {
     std::string file_name = argv[i];
-    std::string old_contents = td::tl::get_file_contents(file_name, "rb");
+    std::string old_contents = td::tl::get_file_contents(file_name);
     std::string new_contents = td::tl::remove_documentation(old_contents);
-    if (new_contents != old_contents && !td::tl::put_file_contents(file_name, "wb", new_contents)) {
+    if (new_contents != old_contents && !td::tl::put_file_contents(file_name, new_contents)) {
       std::fprintf(stderr, "Can't write file %s\n", file_name.c_str());
       std::abort();
     }
diff --git a/tdtl/td/tl/tl_file_utils.cpp b/tdtl/td/tl/tl_file_utils.cpp
index 57d3c0a01..91c859d03 100644
--- a/tdtl/td/tl/tl_file_utils.cpp
+++ b/tdtl/td/tl/tl_file_utils.cpp
@@ -12,8 +12,8 @@
 namespace td {
 namespace tl {
 
-std::string get_file_contents(const std::string &file_name, const std::string &mode) {
-  FILE *f = std::fopen(file_name.c_str(), mode.c_str());
+std::string get_file_contents(const std::string &file_name) {
+  FILE *f = std::fopen(file_name.c_str(), "rb");
   if (f == NULL) {
     return std::string();
   }
@@ -44,8 +44,8 @@ std::string get_file_contents(const std::string &file_name, const std::string &m
   return result;
 }
 
-bool put_file_contents(const std::string &file_name, const std::string &mode, const std::string &contents) {
-  FILE *f = std::fopen(file_name.c_str(), mode.c_str());
+bool put_file_contents(const std::string &file_name, const std::string &contents) {
+  FILE *f = std::fopen(file_name.c_str(), "wb");
   if (f == NULL) {
     std::fprintf(stderr, "Can't open file \"%s\"\n", file_name.c_str());
     return false;
diff --git a/tdtl/td/tl/tl_file_utils.h b/tdtl/td/tl/tl_file_utils.h
index ef837f3bb..6d4cc7132 100644
--- a/tdtl/td/tl/tl_file_utils.h
+++ b/tdtl/td/tl/tl_file_utils.h
@@ -11,9 +11,9 @@
 namespace td {
 namespace tl {
 
-std::string get_file_contents(const std::string &file_name, const std::string &mode);
+std::string get_file_contents(const std::string &file_name);
 
-bool put_file_contents(const std::string &file_name, const std::string &mode, const std::string &contents);
+bool put_file_contents(const std::string &file_name, const std::string &contents);
 
 std::string remove_documentation(const std::string &str);
 
diff --git a/tdtl/td/tl/tl_generate.cpp b/tdtl/td/tl/tl_generate.cpp
index 03dce1556..66d0dcee6 100644
--- a/tdtl/td/tl/tl_generate.cpp
+++ b/tdtl/td/tl/tl_generate.cpp
@@ -837,7 +837,7 @@ void write_tl(const tl_config &config, tl_outputer &out, const TL_writer &w) {
 }
 
 tl_config read_tl_config_from_file(const std::string &file_name) {
-  std::string config = get_file_contents(file_name, "rb");
+  std::string config = get_file_contents(file_name);
   if (config.empty()) {
     std::fprintf(stderr, "Config file %s is empty\n", file_name.c_str());
     std::abort();
@@ -856,14 +856,14 @@ bool write_tl_to_file(const tl_config &config, const std::string &file_name, con
   tl_string_outputer out;
   write_tl(config, out, w);
 
-  std::string old_file_contents = get_file_contents(file_name, "rb");
+  std::string old_file_contents = get_file_contents(file_name);
   if (!w.is_documentation_generated()) {
     old_file_contents = remove_documentation(old_file_contents);
   }
 
   if (old_file_contents != out.get_result()) {
     std::fprintf(stderr, "Write tl to file %s\n", file_name.c_str());
-    return put_file_contents(file_name, "wb", out.get_result());
+    return put_file_contents(file_name, out.get_result());
   }
 
   return true;