diff --git a/Lib/guile/Makefile b/Lib/guile/Makefile
index ff66f9efa..17f5feced 100644
--- a/Lib/guile/Makefile
+++ b/Lib/guile/Makefile
@@ -1,4 +1,4 @@
 
-co::
+co:
 	co RCS/*.i* RCS/*.swg*
 
diff --git a/Lib/mzscheme/Makefile b/Lib/mzscheme/Makefile
index ff66f9efa..17f5feced 100644
--- a/Lib/mzscheme/Makefile
+++ b/Lib/mzscheme/Makefile
@@ -1,4 +1,4 @@
 
-co::
+co:
 	co RCS/*.i* RCS/*.swg*