diff --git a/source/game/StarPlayer.cpp b/source/game/StarPlayer.cpp
index 2a60d2b..400c49e 100644
--- a/source/game/StarPlayer.cpp
+++ b/source/game/StarPlayer.cpp
@@ -1143,7 +1143,7 @@ PlayerInventoryPtr Player::inventory() const {
   return m_inventory;
 }
 
-size_t Player::itemsCanHold(ItemPtr const& items) const {
+uint64_t Player::itemsCanHold(ItemPtr const& items) const {
   return m_inventory->itemsCanFit(items);
 }
 
@@ -1211,7 +1211,7 @@ bool Player::hasItem(ItemDescriptor const& descriptor, bool exactMatch) const {
   return m_inventory->hasItem(descriptor, exactMatch);
 }
 
-size_t Player::hasCountOfItem(ItemDescriptor const& descriptor, bool exactMatch) const {
+uint64_t Player::hasCountOfItem(ItemDescriptor const& descriptor, bool exactMatch) const {
   return m_inventory->hasCountOfItem(descriptor, exactMatch);
 }
 
diff --git a/source/game/StarPlayer.hpp b/source/game/StarPlayer.hpp
index 1773d23..21fe2d6 100644
--- a/source/game/StarPlayer.hpp
+++ b/source/game/StarPlayer.hpp
@@ -198,7 +198,7 @@ public:
   PlayerInventoryPtr inventory() const;
   // Returns the number of items from this stack that could be
   // picked up from the world, using inventory tab filtering
-  size_t itemsCanHold(ItemPtr const& items) const;
+  uint64_t itemsCanHold(ItemPtr const& items) const;
   // Adds items to the inventory, returning the overflow.
   // The items parameter is invalid after use.
   ItemPtr pickupItems(ItemPtr const& items);
@@ -209,7 +209,7 @@ public:
   void triggerPickupEvents(ItemPtr const& item);
 
   bool hasItem(ItemDescriptor const& descriptor, bool exactMatch = false) const;
-  size_t hasCountOfItem(ItemDescriptor const& descriptor, bool exactMatch = false) const;
+  uint64_t hasCountOfItem(ItemDescriptor const& descriptor, bool exactMatch = false) const;
   // altough multiple entries may match, they might have different
   // serializations
   ItemDescriptor takeItem(ItemDescriptor const& descriptor, bool consumePartial = false, bool exactMatch = false);