diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/revplot/PlotCommitList.java b/org.eclipse.jgit/src/org/eclipse/jgit/revplot/PlotCommitList.java
index e8263c5a9..f66e5e7ef 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/revplot/PlotCommitList.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/revplot/PlotCommitList.java
@@ -232,7 +232,9 @@ public class PlotCommitList<L extends PlotLane> extends
 			if (newPos == -1)
 				newPos = positionsAllocated++;
 			freePositions.add(commit.lane.getPosition());
+			activeLanes.remove(commit.lane);
 			commit.lane.position = newPos;
+			activeLanes.add(commit.lane);
 		}
 	}