diff --git a/rebar.config b/rebar.config
index 12b03ffef..aa28d40b0 100644
--- a/rebar.config
+++ b/rebar.config
@@ -90,7 +90,7 @@
 
 {xref_warnings, false}.
 
-{xref_checks, [deprecated_function_calls]}.
+{xref_checks, [deprecated_function_calls, undefined_function_calls]}.
 
 {xref_exclusions, [
                    "(\"gen_transport\":_/_)",