diff --git a/asdf.lisp b/asdf.lisp
index 50a81f2b6502abdc2d5ef9daaf66cd52a2b9b76e..d900c69689e068ead38a0a9a3399c5bc39593ba8 100644
--- a/asdf.lisp
+++ b/asdf.lisp
@@ -48,7 +48,7 @@
 (proclaim '(optimize (debug 3)))
 (declaim (optimize (debug 3)))
 
-(defvar  *compile-file-warnings-behaviour* :error)
+(defvar  *compile-file-warnings-behaviour* :warn)
 (defvar  *compile-file-failure-behaviour* :error)
 
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