diff --git a/TEST_MAPPING b/TEST_MAPPING
index 947b45f..a15764c 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1,5 +1,10 @@
 // Generated by update_crate_tests.py for tests that depend on this crate.
 {
+  "postsubmit": [
+    {
+      "name": "rustc-demangle-capi_test_src_lib"
+    }
+  ],
   "presubmit": [
     {
       "name": "rustc-demangle-capi_test_src_lib"