diff --git a/src/PCLCrypto/iOS/RsaAsymmetricKeyAlgorithmProvider.cs b/src/PCLCrypto/iOS/RsaAsymmetricKeyAlgorithmProvider.cs
index 999cda8a..9635badd 100644
--- a/src/PCLCrypto/iOS/RsaAsymmetricKeyAlgorithmProvider.cs
+++ b/src/PCLCrypto/iOS/RsaAsymmetricKeyAlgorithmProvider.cs
@@ -132,7 +132,7 @@ public ICryptographicKey ImportPublicKey(byte[] keyBlob, CryptographicPublicKeyB
             // Inject the PKCS#1 public key into the KeyChain.
             string keyIdentifier = Guid.NewGuid().ToString();
             string publicKeyIdentifier = RsaCryptographicKey.GetPublicKeyIdentifierWithTag(keyIdentifier);
-            var keyQueryDictionary = RsaCryptographicKey.CreateKeyQueryDictionary(publicKeyIdentifier);
+            using var keyQueryDictionary = RsaCryptographicKey.CreateKeyQueryDictionary(publicKeyIdentifier);
             keyQueryDictionary[KSec.ValueData] = NSData.FromArray(KeyFormatter.Pkcs1.Write(parameters, includePrivateKey: false));
             keyQueryDictionary[KSec.AttrKeyClass] = KSec.AttrKeyClassPublic;
             keyQueryDictionary[KSec.ReturnRef] = NSNumber.FromBoolean(true);