diff --git a/lib/srfi/227.sld b/lib/srfi/227.sld
index 56395836..246e551a 100644
--- a/lib/srfi/227.sld
+++ b/lib/srfi/227.sld
@@ -2,7 +2,5 @@
   (export opt-lambda
           (rename opt-lambda* opt*-lambda)
           let-optionals
-          let-optionals*
-          (rename define-opt define-optionals)
-          (rename define-opt* define-optionals*))
+          let-optionals*)
   (import (chibi optional)))
diff --git a/lib/srfi/227/definition.sld b/lib/srfi/227/definition.sld
new file mode 100644
index 00000000..8427da4e
--- /dev/null
+++ b/lib/srfi/227/definition.sld
@@ -0,0 +1,4 @@
+(define-library (srfi 227 definition)
+  (export (rename define-opt define-optionals)
+          (rename define-opt* define-optionals*))
+  (import (chibi optional)))