diff --git a/gui/builtinMarketBrowser/marketTree.py b/gui/builtinMarketBrowser/marketTree.py
index 8b1286e50..f6c62732c 100644
--- a/gui/builtinMarketBrowser/marketTree.py
+++ b/gui/builtinMarketBrowser/marketTree.py
@@ -53,6 +53,7 @@ class MarketTree(wx.TreeCtrl):
             # And add real market group contents
             sMkt = self.sMkt
             currentMktGrp = sMkt.getMarketGroup(self.GetItemData(root), eager="children")
+
             for childMktGrp in sMkt.getMarketGroupChildren(currentMktGrp):
                 # If market should have items but it doesn't, do not show it
                 if sMkt.marketGroupValidityCheck(childMktGrp) is False:
diff --git a/service/market.py b/service/market.py
index dd2d60d14..b1fc64fb2 100644
--- a/service/market.py
+++ b/service/market.py
@@ -318,6 +318,7 @@ class Market(object):
         self.FORCEDMARKETGROUP = {
             685: False,  # Ship Equipment > Electronic Warfare > ECCM
             681: False,  # Ship Equipment > Electronic Warfare > Sensor Backup Arrays
+            1639: False  # Ship Equipment > Fleet Assistance > Command Processors
         }
 
         # Misc definitions