diff --git a/scheme/more-interfaces.scm b/scheme/more-interfaces.scm
index 7c65237..8bfe2cc 100644
--- a/scheme/more-interfaces.scm
+++ b/scheme/more-interfaces.scm
@@ -481,6 +481,7 @@
 	  string-concatenate
 	  string-concatenate/shared
 	  string-concatenate-reverse
+	  string-concatenate-reverse/shared
 	  string-append/shared
 	  xsubstring string-xcopy!
 	  string-null?