diff --git a/OpenRa.DataStructures/PriorityQueue.cs b/OpenRa.DataStructures/PriorityQueue.cs
index 2c8d610bb0..10266e3b9c 100644
--- a/OpenRa.DataStructures/PriorityQueue.cs
+++ b/OpenRa.DataStructures/PriorityQueue.cs
@@ -86,7 +86,7 @@ namespace OpenRa
 			return ret;
 		}
 
-		public void BubbleInto( int intoLevel, int intoIndex, T val )
+		void BubbleInto( int intoLevel, int intoIndex, T val )
 		{
 			int downLevel = intoLevel + 1;
 			int downIndex = intoIndex << 1;