diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/KeyHealthCardView.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/KeyHealthCardView.java
index a62db21f6..558cd1842 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/KeyHealthCardView.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/KeyHealthCardView.java
@@ -38,6 +38,7 @@ import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.pgp.SecurityProblem.InsecureBitStrength;
 import org.sufficientlysecure.keychain.pgp.SecurityProblem.KeySecurityProblem;
 import org.sufficientlysecure.keychain.pgp.SecurityProblem.NotWhitelistedCurve;
+import org.sufficientlysecure.keychain.pgp.SecurityProblem.UnidentifiedKeyProblem;
 import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
 import org.sufficientlysecure.keychain.ui.widget.KeyHealthPresenter.KeyHealthClickListener;
 import org.sufficientlysecure.keychain.ui.widget.KeyHealthPresenter.KeyHealthMvpView;
@@ -173,6 +174,11 @@ public class KeyHealthCardView extends CardView implements KeyHealthMvpView, OnC
             String curveName = KeyFormattingUtils.getCurveInfo(getContext(), notWhitelistedCurve.curveOid);
             vInsecureProblem.setText(getResources().getString(R.string.key_insecure_unknown_curve_problem, curveName));
             vInsecureSolution.setText(R.string.key_insecure_unknown_curve_solution);
+        } else if (securityProblem instanceof UnidentifiedKeyProblem) {
+            vInsecureProblem.setText(R.string.key_insecure_unidentified_problem);
+            vInsecureSolution.setText(R.string.key_insecure_unknown_curve_solution);
+        } else {
+            throw new IllegalArgumentException("all subclasses of KeySecurityProblem must be handled!");
         }
 
     }
diff --git a/OpenKeychain/src/main/res/values/strings.xml b/OpenKeychain/src/main/res/values/strings.xml
index bc64953f6..e792e4ac2 100644
--- a/OpenKeychain/src/main/res/values/strings.xml
+++ b/OpenKeychain/src/main/res/values/strings.xml
@@ -1861,6 +1861,9 @@
     <string name="key_insecure_unknown_curve_problem">"This key uses the <b>%1$s</b> algorithm, which is not whitelisted."</string>
     <string name="key_insecure_unknown_curve_solution">"This key can\'t be upgraded. For secure communication, the owner must generate a new key."</string>
 
+    <string name="key_insecure_unidentified_problem">"There is an unidentified problem with this key."</string>
+    <string name="key_insecure_unidentified_solution">"Please submit a bug report."</string>
+
     <string name="key_expiry_text">"This key expired on <b>%1$s</b>."</string>
 
 </resources>