diff --git a/clang/lib/ASTMatchers/Dynamic/Registry.cpp b/clang/lib/ASTMatchers/Dynamic/Registry.cpp
index 0a58652884ee65..4c20a1295a8da2 100644
--- a/clang/lib/ASTMatchers/Dynamic/Registry.cpp
+++ b/clang/lib/ASTMatchers/Dynamic/Registry.cpp
@@ -428,6 +428,7 @@ RegistryMaps::RegistryMaps() {
   REGISTER_MATCHER(isPrivateKind);
   REGISTER_MATCHER(isFirstPrivateKind);
   REGISTER_MATCHER(isImplicit);
+  REGISTER_MATCHER(isInAnonymousNamespace);
   REGISTER_MATCHER(isInStdNamespace);
   REGISTER_MATCHER(isInTemplateInstantiation);
   REGISTER_MATCHER(isInitCapture);