diff --git a/eos/saveddata/module.py b/eos/saveddata/module.py
index 40c875a18..c032c23e8 100644
--- a/eos/saveddata/module.py
+++ b/eos/saveddata/module.py
@@ -432,9 +432,9 @@ class Module(HandledItem, HandledCharge, ItemAttrShortcut, ChargeAttrShortcut):
                 and fit.ship.item.ID not in fitsOnType:
             return False
 
-        # AFAIK Citadel modules will always be restricted based on canFitShipType/Group. If we are fitting to a Citadel
-        # and the module does not have these properties, return false to prevent regular ship modules from being used
-        if isinstance(fit.ship, Citadel) and len(fitsOnGroup) == 0 and len(fitsOnType) == 0:
+        # Citadel modules are now under a new category, so we can check this to ensure only structure modules can fit on a citadel
+        if isinstance(fit.ship, Citadel) and self.item.category.name != "Structure Module" or \
+                not isinstance(fit.ship, Citadel) and self.item.category.name == "Structure Module":
             return False
 
         # EVE doesn't let capital modules be fit onto subcapital hulls. Confirmed by CCP Larrikin that this is dictated