diff --git a/pallets/rmrk-core/src/lib.rs b/pallets/rmrk-core/src/lib.rs
index d04cb07a..5f7ba906 100644
--- a/pallets/rmrk-core/src/lib.rs
+++ b/pallets/rmrk-core/src/lib.rs
@@ -246,6 +246,11 @@ pub mod pallet {
 			metadata: BoundedVec<u8, T::StringLimit>,
 		) -> DispatchResult {
 			let sender = ensure_signed(origin.clone())?;
+			if let Some(collection_issuer) = pallet_uniques::Pallet::<T>::class_owner(&collection_id) {
+				ensure!(collection_issuer == sender, Error::<T>::NoPermission);
+			} else {
+				Err(Error::<T>::CollectionUnknown)?;
+			}
 
 			let (collection_id, nft_id) =
 				Self::nft_mint(sender.clone(), owner, collection_id, recipient, royalty, metadata)?;
diff --git a/pallets/rmrk-core/src/tests.rs b/pallets/rmrk-core/src/tests.rs
index 10f6dcf8..a1497949 100644
--- a/pallets/rmrk-core/src/tests.rs
+++ b/pallets/rmrk-core/src/tests.rs
@@ -179,16 +179,18 @@ fn mint_nft_works() {
 			Some(Permill::from_float(20.525)),
 			bvec![0u8; 20]
 		));
-		//TODO BOB shouldn't be able to mint in ALICE's collection?!
-		assert_ok!(RMRKCore::mint_nft(
+		// BOB shouldn't be able to mint in ALICE's collection
+		assert_noop!(RMRKCore::mint_nft(
 			Origin::signed(BOB),
 			BOB,
 			COLLECTION_ID_0,
 			Some(CHARLIE),
 			Some(Permill::from_float(20.525)),
 			bvec![0u8; 20]
-		));
-		assert_eq!(RMRKCore::collections(COLLECTION_ID_0).unwrap().nfts_count, 3);
+		),
+			Error::<Test>::NoPermission
+		);
+		assert_eq!(RMRKCore::collections(COLLECTION_ID_0).unwrap().nfts_count, 2);
 		assert_noop!(
 			RMRKCore::mint_nft(
 				Origin::signed(ALICE),