diff --git a/scip_indexer/SCIPIndexer.cc b/scip_indexer/SCIPIndexer.cc
index 3f3e4bbf2..a3a97254a 100644
--- a/scip_indexer/SCIPIndexer.cc
+++ b/scip_indexer/SCIPIndexer.cc
@@ -477,7 +477,7 @@ class SCIPState {
                                          ast::ExpressionPtr &constantLitExpr) {
         auto *expr = &constantLitExpr;
         while (auto *constantLit = ast::cast_tree<ast::ConstantLit>(*expr)) {
-            if (constantLit->symbol.exists() && constantLit->symbol.asClassOrModuleRef().exists()) {
+            if (constantLit->symbol.exists() && constantLit->symbol.isClassOrModule() && constantLit->symbol.asClassOrModuleRef().exists()) {
                 core::Context ctx(gs, constantLit->symbol, file);
                 auto status = this->saveReference(ctx, GenericSymbolRef::classOrModule(constantLit->symbol),
                                                   /*overrideType*/ std::nullopt, constantLit->loc, 0);
diff --git a/test/scip/testdata/inheritance.rb b/test/scip/testdata/inheritance.rb
index ccbd2c8ec..4b16003f8 100644
--- a/test/scip/testdata/inheritance.rb
+++ b/test/scip/testdata/inheritance.rb
@@ -47,3 +47,7 @@ def write_f_plus_1(a)
   end
 end
 
+Z5 = Object
+class Z6 < Z5
+end
+
diff --git a/test/scip/testdata/inheritance.snapshot.rb b/test/scip/testdata/inheritance.snapshot.rb
index dc51d5d52..ef7ee4b72 100644
--- a/test/scip/testdata/inheritance.snapshot.rb
+++ b/test/scip/testdata/inheritance.snapshot.rb
@@ -89,3 +89,12 @@ def write_f_plus_1(a)
    end
  end
  
+ Z5 = Object
+#^^ definition [..] Z5.
+#relation reference=[..] Object#
+#^^^^^^^^^^^ reference [..] Z5.
+#     ^^^^^^ reference [..] Object#
+ class Z6 < Z5
+#      ^^ definition [..] Z6#
+ end
+