diff --git a/src/saveload/station_sl.cpp b/src/saveload/station_sl.cpp
index b5f4cbcd13..7a0b57d67d 100644
--- a/src/saveload/station_sl.cpp
+++ b/src/saveload/station_sl.cpp
@@ -392,7 +392,7 @@ public:
 		}
 
 		size_t num_cargo = this->GetNumCargo();
-		for (CargoID i = 0; i < num_cargo; i++) {
+		for (size_t i = 0; i < num_cargo; i++) {
 			GoodsEntry *ge = &st->goods[i];
 			SlObject(ge, this->GetLoadDescription());
 			if (IsSavegameVersionBefore(SLV_183)) {
diff --git a/src/saveload/town_sl.cpp b/src/saveload/town_sl.cpp
index 7b91259171..2ba0b9963e 100644
--- a/src/saveload/town_sl.cpp
+++ b/src/saveload/town_sl.cpp
@@ -148,7 +148,7 @@ public:
 	void Load(Town *t) const override
 	{
 		size_t num_cargo = this->GetNumCargo();
-		for (CargoID i = 0; i < num_cargo; i++) {
+		for (size_t i = 0; i < num_cargo; i++) {
 			SlObject(&t->supplied[i], this->GetLoadDescription());
 		}
 	}