diff --git a/CMakeLists.txt b/CMakeLists.txt
index 64360aa..58bb224 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -130,7 +130,7 @@
   set(CMAKE_REQUIRED_LIBRARIES gnutls)
   check_function_exists(gnutls_transport_set_global_errno HAVE_OLD_GNUTLS)
   check_function_exists(gnutls_x509_crt_print HAVE_GNUTLS_X509_CRT_PRINT)
-  check_type_size(gnutls_x509_crt_t GNUTLS_CRT_T)
+  check_type_size(gnutls_x509_crt_t GNUTLS_X509_CRT_T)
   check_type_size(gnutls_datum_t GNUTLS_DATUM_T)
   check_type_size(gnutls_pk_algorithm_t GNUTLS_PK_ALGORITHM_T)
   check_type_size(gnutls_sign_algorithm_t GNUTLS_SIGN_ALGORITHM_T)