diff --git a/FreePackages/Data/FilterablePackage.cs b/FreePackages/Data/FilterablePackage.cs
index 85b16a1..53b1572 100644
--- a/FreePackages/Data/FilterablePackage.cs
+++ b/FreePackages/Data/FilterablePackage.cs
@@ -18,6 +18,7 @@ internal sealed class FilterablePackage {
 		internal ulong ExpiryTime;
 		internal ulong StartTime;
 		internal uint DontGrantIfAppIDOwned;
+		internal uint MustOwnAppToPurchase;
 		internal List<string>? RestrictedCountries;
 		internal bool OnlyAllowRestrictedCountries;
 		internal List<string>? PurchaseRestrictedCountries;
@@ -38,6 +39,7 @@ internal FilterablePackage(uint id, KeyValue kv, bool isNew) {
 			ExpiryTime = kv["extended"]["expirytime"].AsUnsignedLong();
 			StartTime = kv["extended"]["starttime"].AsUnsignedLong();
 			DontGrantIfAppIDOwned = kv["extended"]["dontgrantifappidowned"].AsUnsignedInteger();
+			MustOwnAppToPurchase = kv["extended"]["mustownapptopurchase"].AsUnsignedInteger();
 			RestrictedCountries = kv["extended"]["restrictedcountries"].AsString()?.ToUpper().Split(" ").ToList();
 			OnlyAllowRestrictedCountries = kv["extended"]["onlyallowrestrictedcountries"].AsBoolean();
 			PurchaseRestrictedCountries = kv["extended"]["purchaserestrictedcountries"].AsString()?.ToUpper().Split(" ").ToList();
diff --git a/FreePackages/Handlers/PackageFilter.cs b/FreePackages/Handlers/PackageFilter.cs
index 2dbf9db..3fdfd0b 100644
--- a/FreePackages/Handlers/PackageFilter.cs
+++ b/FreePackages/Handlers/PackageFilter.cs
@@ -237,6 +237,11 @@ internal bool IsRedeemablePackage(FilterablePackage package) {
 			}
 
 			if (package.DontGrantIfAppIDOwned > 0 && OwnedAppIDs.Contains(package.DontGrantIfAppIDOwned)) {
+				// Owns an app that blocks activation
+				return false;
+			}
+
+			if (package.MustOwnAppToPurchase > 0 && !OwnedAppIDs.Contains(package.MustOwnAppToPurchase)) {
 				// Don't own required app
 				return false;
 			}