diff --git a/service/market.py b/service/market.py
index b70866c5b..74fadf7fc 100644
--- a/service/market.py
+++ b/service/market.py
@@ -677,6 +677,10 @@ class Market():
 
             self.priceCache[typeID] = price
 
+        if not price.isValid:
+            # if the price has expired
+            price.price = None
+
         return price
 
     def getPricesNow(self, typeIDs):