diff --git a/CMakeLists.txt b/CMakeLists.txt
index 252a42c..9cf3dd3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -356,7 +356,8 @@
       # system's version (if available) to perform this test.
       set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES};-lz)
     endif()
-    check_function_exists(gnutls_transport_set_global_errno HAVE_OLD_GNUTLS)
+    check_function_exists(gnutls_transport_set_errno HAVE_GNUTLS_SET_ERRNO)
+    check_function_exists(gnutls_transport_set_global_errno HAVE_GNUTLS_SET_GLOBAL_ERRNO)
     check_function_exists(gnutls_x509_crt_print HAVE_GNUTLS_X509_CRT_PRINT)
     check_type_size(gnutls_x509_crt_t GNUTLS_X509_CRT_T)
     check_type_size(gnutls_datum_t GNUTLS_DATUM_T)