diff --git a/ICSharpCode.NRefactory.CSharp/Completion/CSharpCompletionEngineBase.cs b/ICSharpCode.NRefactory.CSharp/Completion/CSharpCompletionEngineBase.cs
index 3574b831ec..778c36bfb9 100644
--- a/ICSharpCode.NRefactory.CSharp/Completion/CSharpCompletionEngineBase.cs
+++ b/ICSharpCode.NRefactory.CSharp/Completion/CSharpCompletionEngineBase.cs
@@ -344,7 +344,7 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 								IsInPreprocessorDirective = true;
 							break;
 						case '/':
-							if (IsInString || IsInChar || IsInVerbatimString)
+							if (IsInString || IsInChar || IsInVerbatimString || IsInSingleComment)
 								break;
 							if (nextCh == '/') {
 								i++;