diff --git a/meson.build b/meson.build
index b69aaddb1f..a171e6dc74 100644
--- a/meson.build
+++ b/meson.build
@@ -619,6 +619,11 @@ if not gssapiopt.disabled()
     cdata.set('HAVE_GSSAPI_GSSAPI_H', 1)
   elif cc.check_header('gssapi.h', args: test_c_args, dependencies: gssapi, required: gssapiopt)
     cdata.set('HAVE_GSSAPI_H', 1)
+  elif cc.check_header('gssapi/gssapi_ext.h', dependencies: gssapi, required: false,
+      args: test_c_args, include_directories: postgres_inc)
+    cdata.set('HAVE_GSSAPI_GSSAPI_EXT_H', 1)
+  elif cc.check_header('gssapi_ext.h', args: test_c_args, dependencies: gssapi, required: gssapiopt)
+    cdata.set('HAVE_GSSAPI_EXT_H', 1)
   else
     have_gssapi = false
   endif