diff --git a/examples/Foo.vy b/examples/Foo.vy
index aa57892..d7ab2b3 100644
--- a/examples/Foo.vy
+++ b/examples/Foo.vy
@@ -57,3 +57,8 @@ implements: Ownable
 @external
 def owner() -> address:
     return self._owner
+
+N_COINS: constant(uint256) = 2
+A_MULTIPLIER: constant(uint256) = 10000
+
+MIN_A: constant(uint256) = N_COINS**N_COINS * A_MULTIPLIER / 10
diff --git a/tests/test_navigation.py b/tests/test_navigation.py
index 41787ac..4ba7a27 100644
--- a/tests/test_navigation.py
+++ b/tests/test_navigation.py
@@ -70,6 +70,10 @@ def test_find_references_constant(doc, navigator):
     references = navigator.find_references(doc, pos)
     assert len(references) == 1
 
+    pos = Position(line=60, character=0)
+    references = navigator.find_references(doc, pos)
+    assert len(references) == 2
+
 
 def test_find_references_function_local_var(doc, navigator):
     pos = Position(line=20, character=5)
diff --git a/vyper_lsp/ast.py b/vyper_lsp/ast.py
index 9bac1dc..aa56f44 100644
--- a/vyper_lsp/ast.py
+++ b/vyper_lsp/ast.py
@@ -118,7 +118,7 @@ def get_internal_function_nodes(self):
 
         for node in function_nodes:
             for decorator in node.decorator_list:
-                if decorator.id == "internal":
+                if isinstance(decorator, nodes.Name) and decorator.id == "internal":
                     internal_nodes.append(node)
 
         return internal_nodes