diff --git a/ql/src/codeql_ruby/controlflow/ControlFlowGraph.qll b/ql/src/codeql_ruby/controlflow/ControlFlowGraph.qll
index 30e75576397..519d2b30dad 100644
--- a/ql/src/codeql_ruby/controlflow/ControlFlowGraph.qll
+++ b/ql/src/codeql_ruby/controlflow/ControlFlowGraph.qll
@@ -9,7 +9,7 @@ private import internal.Splitting
 private import internal.Completion
 
 /** An AST node with an associated control-flow graph. */
-class CfgScope extends AstNode {
+class CfgScope extends Scope {
   CfgScope() { this instanceof CfgScope::Range_ }
 
   /** Gets the CFG scope that this scope is nested under, if any. */