diff --git a/collects/compiler/embed-sig.ss b/collects/compiler/embed-sig.ss
index b177327dbd..dede40321b 100644
--- a/collects/compiler/embed-sig.ss
+++ b/collects/compiler/embed-sig.ss
@@ -1,6 +1,6 @@
 
 (module embed-sig mzscheme
-  (require (lib "unitsig.ss"))
+  (require (lib "unit.ss"))
   (provide compiler:embed^)
 
   (define-signature compiler:embed^
diff --git a/collects/compiler/sig.ss b/collects/compiler/sig.ss
index 16729ae628..584e5821a9 100644
--- a/collects/compiler/sig.ss
+++ b/collects/compiler/sig.ss
@@ -1,7 +1,7 @@
 
 (module sig mzscheme
 
-  (require (lib "unitsig.ss"))
+  (require (lib "unit.ss"))
 
   (provide compiler:option^
 	   compiler^
diff --git a/collects/launcher/launcher-sig.ss b/collects/launcher/launcher-sig.ss
index 37aba83599..ebcdce03a8 100644
--- a/collects/launcher/launcher-sig.ss
+++ b/collects/launcher/launcher-sig.ss
@@ -1,11 +1,6 @@
 
-(module launcher-sig mzscheme
-  (require (lib "unitsig.ss"))
-  
-  (provide launcher^)
-
-  (define-signature launcher^
-    (make-mred-launcher
+(module launcher-sig (lib "a-signature.ss")
+     make-mred-launcher
      make-mzscheme-launcher
 
      make-mred-program-launcher
@@ -35,4 +30,4 @@
      build-aux-from-path
      current-launcher-variant
      available-mred-variants
-     available-mzscheme-variants)))
+     available-mzscheme-variants)
diff --git a/collects/setup/option-sig.ss b/collects/setup/option-sig.ss
index 2a6b1c78a4..517d218662 100644
--- a/collects/setup/option-sig.ss
+++ b/collects/setup/option-sig.ss
@@ -1,6 +1,6 @@
 
 (module option-sig mzscheme
-  (require (lib "unitsig.ss"))
+  (require (lib "unit.ss"))
   
   (provide setup-option^)