diff --git a/lix/libutil/logging.cc b/lix/libutil/logging.cc
index c301b1706..3e3ed3548 100644
--- a/lix/libutil/logging.cc
+++ b/lix/libutil/logging.cc
@@ -21,11 +21,6 @@ static GlobalConfig::Register rLoggerSettings(&loggerSettings);
 
 Logger * logger = makeSimpleLogger(true);
 
-void Logger::warn(const std::string & msg)
-{
-    log(lvlWarn, ANSI_WARNING "warning:" ANSI_NORMAL " " + msg);
-}
-
 void Logger::writeToStdout(std::string_view s)
 {
     writeFull(
diff --git a/lix/libutil/logging.hh b/lix/libutil/logging.hh
index 8e9aaf662..4ebccb02d 100644
--- a/lix/libutil/logging.hh
+++ b/lix/libutil/logging.hh
@@ -140,8 +140,6 @@ public:
         logEI(ei);
     }
 
-    virtual void warn(const std::string & msg);
-
     virtual void startActivity(ActivityId act, Verbosity lvl, ActivityType type,
         const std::string & s, const Fields & fields, ActivityId parent) { };
 
@@ -279,9 +277,11 @@ extern Verbosity verbosity;
  * if verbosity >= lvlWarn, print a message with a yellow 'warning:' prefix.
  */
 template<typename... Args>
-inline void warn(const std::string & fs, const Args & ... args)
+inline void warn(const std::string & fs, const Args &... args)
 {
-    logger->warn(HintFmt(fs, args...).str());
+    logger->log(
+        lvlWarn, fmt(ANSI_WARNING "warning:" ANSI_NORMAL " %1%", HintFmt(fs, args...).str())
+    );
 }
 
 void writeLogsToStderr(std::string_view s);
diff --git a/lix/nix/flake.cc b/lix/nix/flake.cc
index 2051f2c1a..ee638c141 100644
--- a/lix/nix/flake.cc
+++ b/lix/nix/flake.cc
@@ -1340,7 +1340,10 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
                         if (!json)
                             logger->cout(fmt("%s " ANSI_WARNING "omitted" ANSI_NORMAL " (use '--all-systems' to show)", headerPrefix));
                         else {
-                            logger->warn(fmt("%s omitted (use '--all-systems' to show)", concatStringsSep(".", attrPath)));
+                            warn(
+                                "%s omitted (use '--all-systems' to show)",
+                                concatStringsSep(".", attrPath)
+                            );
                         }
                     } else {
                         if (visitor.isDerivation(*state))
@@ -1364,13 +1367,19 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
                         if (!json)
                             logger->cout(fmt("%s " ANSI_WARNING "omitted" ANSI_NORMAL " (use '--legacy' to show)", headerPrefix));
                         else {
-                            logger->warn(fmt("%s omitted (use '--legacy' to show)", concatStringsSep(".", attrPath)));
+                            warn(
+                                "%s omitted (use '--legacy' to show)",
+                                concatStringsSep(".", attrPath)
+                            );
                         }
                     } else if (!showAllSystems && attrPath[1] != localSystem) {
                         if (!json)
                             logger->cout(fmt("%s " ANSI_WARNING "omitted" ANSI_NORMAL " (use '--all-systems' to show)", headerPrefix));
                         else {
-                            logger->warn(fmt("%s omitted (use '--all-systems' to show)", concatStringsSep(".", attrPath)));
+                            warn(
+                                "%s omitted (use '--all-systems' to show)",
+                                concatStringsSep(".", attrPath)
+                            );
                         }
                     } else {
                         if (visitor.isDerivation(*state))