diff --git a/gui/builtinMarketBrowser/itemView.py b/gui/builtinMarketBrowser/itemView.py
index cfe6621a6..75bc36e2f 100644
--- a/gui/builtinMarketBrowser/itemView.py
+++ b/gui/builtinMarketBrowser/itemView.py
@@ -245,11 +245,17 @@ class ItemView(Display):
             if slot is None:
                 continue
             
-            # Rigs don't use CPU/power, they use calibration - allow them through
+            # Rigs don't use CPU/power, they use calibration - check rig size compatibility
             if slot == FittingSlot.RIG:
                 # Check if item can fit on the ship
                 if not fit.canFit(item):
                     continue
+                # Check rig size compatibility with ship
+                shipRigSize = fit.ship.getModifiedItemAttr("rigSize")
+                itemRigSize = item.attributes.get("rigSize")
+                if shipRigSize is not None and itemRigSize is not None:
+                    if shipRigSize != itemRigSize.value:
+                        continue
                 fittingItems.append(item)
                 continue