diff --git a/src/c/error.d b/src/c/error.d
index ca5170954..49432bea2 100644
--- a/src/c/error.d
+++ b/src/c/error.d
@@ -71,6 +71,9 @@ ecl_thread_internal_error(const char *s)
     fprintf(stderr, "  [%d: %s]\n", saved_errno,
             strerror(saved_errno));
   }
+  fprintf(stderr,
+          "\nDid you forget to call `ecl_import_current_thread'?\n"
+          "Exitting thread.\n");
   fflush(stderr);
 #ifdef ECL_WINDOWS_THREADS
   ExitThread(0);