diff --git a/src/indexer.cc b/src/indexer.cc
index 0c8a250a..312d9e6e 100644
--- a/src/indexer.cc
+++ b/src/indexer.cc
@@ -129,6 +129,7 @@ ClangStorageClass GetStorageClass(CX_StorageClass storage) {
       return ClangStorageClass::SC_Register;
     default:
       assert(0);
+      return ClangStorageClass::SC_Invalid;
   }
 }