diff --git a/rtc_base/logging.h b/rtc_base/logging.h
index aa530e7b20..2c3a6dcb22 100644
--- a/rtc_base/logging.h
+++ b/rtc_base/logging.h
@@ -119,7 +119,11 @@ class LogLineRef {
   absl::string_view tag() const { return tag_; }
   LoggingSeverity severity() const { return severity_; }
 
+#if RTC_LOG_ENABLED()
   std::string DefaultLogLine() const;
+#else
+  std::string DefaultLogLine() const { return ""; }
+#endif
 
  private:
   friend class LogMessage;