diff --git a/collects/setup/sig.ss b/collects/setup/option-sig.ss
similarity index 91%
rename from collects/setup/sig.ss
rename to collects/setup/option-sig.ss
index 8249020cee..780485d8e0 100644
--- a/collects/setup/sig.ss
+++ b/collects/setup/option-sig.ss
@@ -1,5 +1,5 @@
 
-(module sig mzscheme
+(module option-sig mzscheme
   (import (lib "unitsig.ss"))
   
   (export setup-option^)