diff --git a/ide/main.pp b/ide/main.pp
index 02321cc0c4..d5ce7ed8a8 100644
--- a/ide/main.pp
+++ b/ide/main.pp
@@ -12372,6 +12372,7 @@ end;
 procedure TMainIDE.OnCompilerParseStampIncreased;
 begin
   FRebuildingCompilerGraphCodeToolsDefinesNeeded:=true;
+  CodeToolBoss.DefineTree.ClearCache;
 end;
 
 function TMainIDE.SaveSourceEditorChangesToCodeCache(PageIndex: integer): boolean;