diff --git a/lib/srfi/124.sld b/lib/srfi/124.sld
index 23cdc88a..9afcb92a 100644
--- a/lib/srfi/124.sld
+++ b/lib/srfi/124.sld
@@ -1,4 +1,4 @@
 (define-library (srfi 124)
   (export make-ephemeron ephemeron? ephemeron-broken?
-	  ephemeron-key ephemeron-datum)
+          ephemeron-key ephemeron-datum)
   (import (rename (chibi weak) (ephemeron-value ephemeron-datum))))