diff --git a/org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/RecordingLogger.java b/org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/RecordingLogger.java
index 9c3c980ad..af63084e9 100644
--- a/org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/RecordingLogger.java
+++ b/org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/RecordingLogger.java
@@ -180,11 +180,15 @@ public void warn(String msg) {
 
 	@Override
 	public void warn(String format, Object arg) {
-		warn(format, Collections.singleton(arg));
+		addWarnings(format, Collections.singleton(arg));
 	}
 
 	@Override
 	public void warn(String format, Object... arguments) {
+		addWarnings(format, arguments);
+	}
+
+	private void addWarnings(String format, Object... arguments) {
 		synchronized (warnings) {
 			int i = 0;
 			int index = format.indexOf("{}");