diff --git a/src/Components/Modules/Download.cpp b/src/Components/Modules/Download.cpp
index 6946cf10..1c95d4f0 100644
--- a/src/Components/Modules/Download.cpp
+++ b/src/Components/Modules/Download.cpp
@@ -413,6 +413,13 @@ namespace Components
 		{
 			std::string url(message->uri.p, message->uri.len);
 			Utils::String::Replace(url, "\\", "/");
+			
+			if (url.length() < 6)
+			{
+				Download::Forbid(nc);
+				return;
+			}
+			
 			url = url.substr(6);
 
 			Utils::String::Replace(url, "%20", " ");