diff --git a/java/com/googlesource/gerrit/plugins/supermanifest/SuperManifestRefUpdatedListener.java b/java/com/googlesource/gerrit/plugins/supermanifest/SuperManifestRefUpdatedListener.java
index aaa9a92..0424d02 100644
--- a/java/com/googlesource/gerrit/plugins/supermanifest/SuperManifestRefUpdatedListener.java
+++ b/java/com/googlesource/gerrit/plugins/supermanifest/SuperManifestRefUpdatedListener.java
@@ -118,17 +118,15 @@
   }
 
   private void warn(String formatStr, Object... args) {
-    // The docs claim that log.warn() uses format strings, but it doesn't seem to work, so we do it
-    // explicitly.
-    logger.atWarning().log(canonicalWebUrl + " : " + formatStr, args);
+    logger.atWarning().log("%s: %s", canonicalWebUrl, String.format(formatStr, args));
   }
 
   private void error(String formatStr, Object... args) {
-    logger.atSevere().log(canonicalWebUrl + " : " + formatStr, args);
+    logger.atSevere().log("%s: %s", canonicalWebUrl, String.format(formatStr, args));
   }
 
   private void info(String formatStr, Object... args) {
-    logger.atInfo().log(canonicalWebUrl + " : " + formatStr, args);
+    logger.atInfo().log("%s: %s", canonicalWebUrl, String.format(formatStr, args));
   }
 
   /*