diff --git a/org.eclipse.jdt.debug/model/org/eclipse/jdt/internal/debug/core/model/JDIDebugTarget.java b/org.eclipse.jdt.debug/model/org/eclipse/jdt/internal/debug/core/model/JDIDebugTarget.java
index bb604cc..5b55b3d 100644
--- a/org.eclipse.jdt.debug/model/org/eclipse/jdt/internal/debug/core/model/JDIDebugTarget.java
+++ b/org.eclipse.jdt.debug/model/org/eclipse/jdt/internal/debug/core/model/JDIDebugTarget.java
@@ -676,7 +676,21 @@
 	@Override
 	public IThread[] getThreads() {
 		synchronized (fThreads) {
-			return fThreads.toArray(new IThread[0]);
+			IThread[] threads = new IThread[fThreads.size()];
+			int index = 0;
+			for (JDIThread thread : fThreads) {
+				if (!thread.isSystemThread()) {
+					threads[index] = thread;
+					++index;
+				}
+			}
+			for (JDIThread thread : fThreads) {
+				if (thread.isSystemThread()) {
+					threads[index] = thread;
+					++index;
+				}
+			}
+			return threads;
 		}
 	}