diff --git a/crypto/src/openpgp/PgpPublicKey.cs b/crypto/src/openpgp/PgpPublicKey.cs
index 672ce9548..13d87021f 100644
--- a/crypto/src/openpgp/PgpPublicKey.cs
+++ b/crypto/src/openpgp/PgpPublicKey.cs
@@ -1050,7 +1050,7 @@ private static PgpPublicKey RemoveCert(PgpPublicKey	key, IUserDataPacket id)
             PgpPublicKey returnKey = new PgpPublicKey(key);
             bool found = false;
 
-            for (int i = 0; i < returnKey.ids.Count; i++)
+            for (int i = returnKey.ids.Count-1; i >=0; i--)
             {
                 if (id.Equals(returnKey.ids[i]))
                 {