diff --git a/src/AddIns/Misc/CodeAnalysis/Src/AnalysisProjectOptions.cs b/src/AddIns/Misc/CodeAnalysis/Src/AnalysisProjectOptions.cs
index 3caa44489e..5afee16012 100644
--- a/src/AddIns/Misc/CodeAnalysis/Src/AnalysisProjectOptions.cs
+++ b/src/AddIns/Misc/CodeAnalysis/Src/AnalysisProjectOptions.cs
@@ -441,6 +441,7 @@ namespace ICSharpCode.CodeAnalysis
 						b.Append(asm);
 					}
 					this.RuleAssemblies = b.ToString();
+					OnOptionChanged(new EventArgs());
 				}
 			}
 		}