diff --git a/core/deployment/src/main/java/io/quarkus/deployment/steps/ConfigGenerationBuildStep.java b/core/deployment/src/main/java/io/quarkus/deployment/steps/ConfigGenerationBuildStep.java
index 167849ed1c349..be3f6406bcebb 100644
--- a/core/deployment/src/main/java/io/quarkus/deployment/steps/ConfigGenerationBuildStep.java
+++ b/core/deployment/src/main/java/io/quarkus/deployment/steps/ConfigGenerationBuildStep.java
@@ -200,9 +200,7 @@ private static void reportUnknownBuildProperties(LaunchMode launchMode, Set<Stri
         // So it only reports during the build, because it is very likely that the property is available in runtime
         // and, it will be caught by the RuntimeConfig and log double warnings
         if (!launchMode.isDevOrTest()) {
-            for (String unknownProperty : unknownBuildProperties) {
-                ConfigDiagnostic.unknown(unknownProperty);
-            }
+            ConfigDiagnostic.unknownProperties(new ArrayList<>(unknownBuildProperties));
         }
     }