diff --git a/tdutils/td/utils/TsFileLog.cpp b/tdutils/td/utils/TsFileLog.cpp
index e8f75c964..bc5b04ff3 100644
--- a/tdutils/td/utils/TsFileLog.cpp
+++ b/tdutils/td/utils/TsFileLog.cpp
@@ -40,9 +40,6 @@ class TsFileLog : public LogInterface {
     return res;
   }
 
-  void append(CSlice cslice) override {
-    return append(cslice, -1);
-  }
   void append(CSlice cslice, int log_level) override {
     get_current_logger()->append(cslice, log_level);
   }
diff --git a/tdutils/td/utils/logging.h b/tdutils/td/utils/logging.h
index aa5bab42f..94a20c13e 100644
--- a/tdutils/td/utils/logging.h
+++ b/tdutils/td/utils/logging.h
@@ -182,14 +182,12 @@ class LogInterface {
   LogInterface(LogInterface &&) = delete;
   LogInterface &operator=(LogInterface &&) = delete;
   virtual ~LogInterface() = default;
-  virtual void append(CSlice slice) {
-    append(slice, -1);
-  }
-  virtual void append(CSlice slice, int /*log_level*/) {
-    append(slice);
-  }
+
+  virtual void append(CSlice slice, int log_level) = 0;
+
   virtual void rotate() {
   }
+
   virtual vector<string> get_file_paths() {
     return {};
   }