diff --git a/prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/mldsa/MLDSAKeyFactorySpi.java b/prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/mldsa/MLDSAKeyFactorySpi.java
index bfdbd8fa0a..2dcd6fedcb 100644
--- a/prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/mldsa/MLDSAKeyFactorySpi.java
+++ b/prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/mldsa/MLDSAKeyFactorySpi.java
@@ -93,11 +93,11 @@ else if (key instanceof BCMLDSAPublicKey)
         }
         else
         {
-            throw new InvalidKeySpecException("Unsupported key type: "
+            throw new InvalidKeySpecException("unsupported key type: "
                 + key.getClass() + ".");
         }
 
-        throw new InvalidKeySpecException("Unknown key specification: "
+        throw new InvalidKeySpecException("unknown key specification: "
             + keySpec + ".");
     }
 
@@ -109,7 +109,7 @@ public final Key engineTranslateKey(Key key)
             return key;
         }
 
-        throw new InvalidKeyException("Unsupported key type");
+        throw new InvalidKeyException("unsupported key type");
     }
 
     public PrivateKey engineGeneratePrivate(
diff --git a/prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/mlkem/MLKEMKeyFactorySpi.java b/prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/mlkem/MLKEMKeyFactorySpi.java
index f424474565..c6d9c5a0f6 100644
--- a/prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/mlkem/MLKEMKeyFactorySpi.java
+++ b/prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/mlkem/MLKEMKeyFactorySpi.java
@@ -90,7 +90,7 @@ else if (key instanceof BCMLKEMPublicKey)
                 + key.getClass() + ".");
         }
 
-        throw new InvalidKeySpecException("Unknown key specification: "
+        throw new InvalidKeySpecException("unknown key specification: "
             + keySpec + ".");
     }
 
@@ -102,7 +102,7 @@ public final Key engineTranslateKey(Key key)
             return key;
         }
 
-        throw new InvalidKeyException("Unsupported key type");
+        throw new InvalidKeyException("unsupported key type");
     }
 
     public PrivateKey engineGeneratePrivate(