diff --git a/src/Core/Package.vala b/src/Core/Package.vala
index bd2c5ef35..756fece8a 100644
--- a/src/Core/Package.vala
+++ b/src/Core/Package.vala
@@ -734,6 +734,10 @@ public class AppCenterCore.Package : Object {
                     }
 
                     break;
+
+                case AppStream.IconKind.UNKNOWN:
+                    warning ("'%s' is an unknown kind of AppStream icon", _icon.get_name ());
+                    break;
             }
         }
 
diff --git a/src/Core/PackageKitBackend.vala b/src/Core/PackageKitBackend.vala
index 180ae7b2a..8acc066d6 100644
--- a/src/Core/PackageKitBackend.vala
+++ b/src/Core/PackageKitBackend.vala
@@ -1092,6 +1092,22 @@ public class AppCenterCore.PackageKitBackend : Backend, Object {
             case Pk.ProgressType.STATUS:
                 status = (Pk.Status) progress.status;
                 break;
+
+            case Pk.ProgressType.CALLER_ACTIVE:
+            case Pk.ProgressType.DOWNLOAD_SIZE_REMAINING:
+            case Pk.ProgressType.ELAPSED_TIME:
+            case Pk.ProgressType.INVALID:
+            case Pk.ProgressType.PACKAGE:
+            case Pk.ProgressType.PACKAGE_ID:
+            case Pk.ProgressType.PERCENTAGE:
+            case Pk.ProgressType.REMAINING_TIME:
+            case Pk.ProgressType.ROLE:
+            case Pk.ProgressType.SPEED:
+            case Pk.ProgressType.TRANSACTION_FLAGS:
+            case Pk.ProgressType.TRANSACTION_ID:
+            case Pk.ProgressType.UID:
+                // All other ProgressTypes deliberately ignored
+                break;
         }
     }