diff --git a/library/ecp_invasive.h b/library/ecp_invasive.h
index 1dc5567..94867b9 100644
--- a/library/ecp_invasive.h
+++ b/library/ecp_invasive.h
@@ -306,7 +306,7 @@
  * \param[in,out] N The address of the modulus structure to populate.
  *                  Must be initialized.
  * \param[in] id    The mbedtls_ecp_group_id for which to initialise the modulus.
- * \param[in] ctype The mbedtls_ecp_curve_type identifier for a coordinate modulus (P)
+ * \param[in] ctype The mbedtls_ecp_modulus_type identifier for a coordinate modulus (P)
  *                  or a scalar modulus (N).
  *
  * \return          \c 0 if successful.
@@ -317,7 +317,7 @@
 MBEDTLS_STATIC_TESTABLE
 int mbedtls_ecp_modulus_setup(mbedtls_mpi_mod_modulus *N,
                               const mbedtls_ecp_group_id id,
-                              const mbedtls_ecp_curve_type ctype);
+                              const mbedtls_ecp_modulus_type ctype);
 
 #endif /* MBEDTLS_TEST_HOOKS && MBEDTLS_ECP_C */