diff --git a/CHANGES.txt b/CHANGES.txt
index be73c1e1..0a76678a 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -2,6 +2,9 @@
 TradeDangerous, Copyright (C) Oliver "kfsone" Smith, July 2014
 ==============================================================================
 
+[wip]
+. (kfsone) Fixed 'set changed size' error in run command
+
 v6.9.2 Feb 08 2015
 . (kfsone) Feature #158 Find rares based on distance from multiple systems
        "--away <ly>" and "--from <system1> --from <system2> ..."
diff --git a/commands/run_cmd.py b/commands/run_cmd.py
index 844531a2..5567bc96 100644
--- a/commands/run_cmd.py
+++ b/commands/run_cmd.py
@@ -461,12 +461,12 @@ def checkStationSuitability(cmdenv, station, src=None):
 def filterStationSet(src, cmdenv, stnSet):
     if not stnSet:
         return stnSet
-    for place in stnSet:
-        if not isinstance(place, Station):
-            continue
-        if not checkStationSuitability(cmdenv, place):
-            stnSet.remove(place)
-            continue
+    unsuited = set(
+        place for place in stnSet
+        if isinstance(place, Station) and \
+            not checkStationSuitability(cmdenv, place)
+    )
+    stnSet -= unsuited
     if not stnSet:
         raise CommandLineError(
                 "No {} station met your criteria.".format(