diff --git a/pgpainless-core/src/main/kotlin/org/pgpainless/key/generation/KeyRingBuilder.kt b/pgpainless-core/src/main/kotlin/org/pgpainless/key/generation/KeyRingBuilder.kt
index c101e2c0..2e4a6642 100644
--- a/pgpainless-core/src/main/kotlin/org/pgpainless/key/generation/KeyRingBuilder.kt
+++ b/pgpainless-core/src/main/kotlin/org/pgpainless/key/generation/KeyRingBuilder.kt
@@ -82,7 +82,7 @@ class KeyRingBuilder : KeyRingBuilderInterface<KeyRingBuilder> {
         }
     }
 
-    private fun keyIsCertificationCapable(keySpec: KeySpec) = keySpec.keyType.canCertify()
+    private fun keyIsCertificationCapable(keySpec: KeySpec) = keySpec.keyType.canCertify
 
     override fun build(): PGPSecretKeyRing {
         val keyFingerprintCalculator = ImplementationFactory.getInstance()