diff --git a/tools/chplcheck/src/rules.py b/tools/chplcheck/src/rules.py
index f8b11fc00d2b..fa81119bd931 100644
--- a/tools/chplcheck/src/rules.py
+++ b/tools/chplcheck/src/rules.py
@@ -885,7 +885,7 @@ def unwrap_intermediate_block(node: AstNode) -> Optional[AstNode]:
                 # only loops and NamedDecls can be anchors for indentation
                 anchor = (
                     parent_for_indentation
-                    if not isinstance(parent_for_indentation, (Loop, NamedDecl))
+                    if isinstance(parent_for_indentation, (Loop, NamedDecl))
                     else None
                 )
                 yield AdvancedRuleResult(child, anchor=anchor)