diff --git a/docs/rh-log.txt b/docs/rh-log.txt
index 2c7c7eaeb2..bfae5c120b 100644
--- a/docs/rh-log.txt
+++ b/docs/rh-log.txt
@@ -1,4 +1,5 @@
 January 2, 2010  (Changes by Graf Zahl)
+- fixed: Polyobjects could contain segs that weren't flagged as such.
 - fixed: Trying to show a popup crashed in the SBARINFO code because of a 
   missing NULL pointer check.
 - fixed: The ACS thinker needs its own statnum above all actors. Otherwise
diff --git a/src/po_man.cpp b/src/po_man.cpp
index 37faf119a1..8ed58cf8cd 100644
--- a/src/po_man.cpp
+++ b/src/po_man.cpp
@@ -1545,6 +1545,7 @@ static void TranslateToStartSpot (int tag, int originX, int originY)
 	validcount++;
 	for (i = 0; i < po->numsegs; i++, tempSeg++, tempPt++)
 	{
+		(*tempSeg)->bPolySeg = true;	// this is not set for all segs
 		(*tempSeg)->sidedef->Flags |= WALLF_POLYOBJ;
 		if ((*tempSeg)->linedef->validcount != validcount)
 		{