diff --git a/launch/src/main/scala/xsbt/boot/CheckProxy.scala b/launch/src/main/scala/xsbt/boot/CheckProxy.scala
index a45a90b1e..af3cdc651 100644
--- a/launch/src/main/scala/xsbt/boot/CheckProxy.scala
+++ b/launch/src/main/scala/xsbt/boot/CheckProxy.scala
@@ -34,7 +34,7 @@ object CheckProxy
 			catch
 			{
 				case e: MalformedURLException =>
-					System.out.println("Warning: could not parse http_proxy setting: " + e.toString)
+					System.out.println(s"Warning: could not parse $envURL setting: ${e.toString}")
 			}
 		}
 	}