diff --git a/pg/src/main/java/org/bouncycastle/openpgp/api/OpenPGPCertificate.java b/pg/src/main/java/org/bouncycastle/openpgp/api/OpenPGPCertificate.java
index 267cfd72ce..04a384786f 100644
--- a/pg/src/main/java/org/bouncycastle/openpgp/api/OpenPGPCertificate.java
+++ b/pg/src/main/java/org/bouncycastle/openpgp/api/OpenPGPCertificate.java
@@ -1949,7 +1949,7 @@ else if (signature.getSignatureType() == PGPSignature.PRIMARYKEY_BINDING)
                     throw new IncorrectOpenPGPSignatureException(this, "Key Signature is not correct.");
                 }
             }
-            catch (PGPException e)
+            catch (PGPException | ClassCastException e)
             {
                 this.isCorrect = false;
                 throw new PGPSignatureException("Key Signature could not be verified.", e);
@@ -1982,7 +1982,7 @@ protected void verifyUserIdSignature(OpenPGPComponentKey issuer,
                     throw new IncorrectOpenPGPSignatureException(this, "UserID Signature is not correct.");
                 }
             }
-            catch (PGPException e)
+            catch (PGPException | ClassCastException e)
             {
                 this.isCorrect = false;
                 throw new PGPSignatureException("UserID Signature could not be verified.", e);
@@ -2015,7 +2015,7 @@ protected void verifyUserAttributeSignature(OpenPGPComponentKey issuer,
                     throw new IncorrectOpenPGPSignatureException(this, "UserAttribute Signature is not correct.");
                 }
             }
-            catch (PGPException e)
+            catch (PGPException | ClassCastException e)
             {
                 this.isCorrect = false;
                 throw new PGPSignatureException("Could not verify UserAttribute Signature.", e);