diff --git a/iis/mymodule.cpp b/iis/mymodule.cpp
index 464968cba9..00a45d4a03 100644
--- a/iis/mymodule.cpp
+++ b/iis/mymodule.cpp
@@ -1007,6 +1007,16 @@ CMyHttpModule::OnBeginRequest(
 		break;
 	}
 
+	if (r->method_number == M_INVALID)
+	{
+		if ((req->pUnknownVerb != NULL) && (strcmp(req->pUnknownVerb, "PATCH")==0))
+		{
+			// this is a PATCH command and should be supported
+			r->method = "PATCH";
+			r->method_number = M_PATCH;
+		}
+	}
+	
 	if(HTTP_EQUAL_VERSION(req->Version, 0, 9))
 		r->protocol = "HTTP/0.9";
 	else if(HTTP_EQUAL_VERSION(req->Version, 1, 0))