diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/StringUtils.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/StringUtils.java
index 7e8bbc80f..b2e344608 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/StringUtils.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/StringUtils.java
@@ -121,7 +121,7 @@ public static String capitalize(String str) {
 		if (str == null || (strLen = str.length()) == 0) {
 			return str;
 		}
-		return new StringBuffer(strLen)
+		return new StringBuilder(strLen)
 				.append(Character.toTitleCase(str.charAt(0)))
 				.append(str.substring(1)).toString();
 	}