diff --git a/build/org.eclipse.pde.build/src/org/eclipse/pde/internal/build/builder/ClasspathComputer3_0.java b/build/org.eclipse.pde.build/src/org/eclipse/pde/internal/build/builder/ClasspathComputer3_0.java
index 684a82ba2fb..f2cfcc9b6a6 100644
--- a/build/org.eclipse.pde.build/src/org/eclipse/pde/internal/build/builder/ClasspathComputer3_0.java
+++ b/build/org.eclipse.pde.build/src/org/eclipse/pde/internal/build/builder/ClasspathComputer3_0.java
@@ -202,7 +202,7 @@ private void recordRequiredIds(BundleDescription model) {
 			bundleProperties = new Properties();
 			model.setUserObject(bundleProperties);
 		}
-		StringBuffer buffer = new StringBuffer();
+		StringBuilder buffer = new StringBuilder();
 		for (Long requiredId : requiredIds) {
 			buffer.append(requiredId.toString());
 			buffer.append(':');