diff --git a/src/security/tpm/back-end-osx.cpp b/src/security/tpm/back-end-osx.cpp
index 178ae55..7f1aed1 100644
--- a/src/security/tpm/back-end-osx.cpp
+++ b/src/security/tpm/back-end-osx.cpp
@@ -341,8 +341,8 @@
       break;
     }
     case KeyType::EC: {
-      const EcdsaKeyParams& ecdsaParams = static_cast<const EcdsaKeyParams&>(params);
-      keySize = ecdsaParams.getKeySize();
+      const EcKeyParams& ecParams = static_cast<const EcKeyParams&>(params);
+      keySize = ecParams.getKeySize();
       break;
     }
     default: {