diff --git a/BIN-Sequence.R b/BIN-Sequence.R
index 2861cb3..087ae5b 100644
--- a/BIN-Sequence.R
+++ b/BIN-Sequence.R
@@ -177,7 +177,7 @@ toupper(tolower(s))
 
 
 # ===   6.1.2  Reverse                    
-reverse(s)
+Biostrings::reverse(s)
 
 
 # ===   6.1.3  Change characters