diff --git a/rebar.config b/rebar.config
index 46cacba6a..a0dadde91 100644
--- a/rebar.config
+++ b/rebar.config
@@ -114,7 +114,7 @@
 
 {xref_warnings, false}.
 
-{xref_checks, [deprecated_function_calls]}.
+{xref_checks, [deprecated_function_calls, undefined_function_calls]}.
 
 {xref_exclusions, [
                    "(\"gen_transport\":_/_)",