diff --git a/bwa.wdl b/bwa.wdl
index 90b017fc26583fe88d54ce5d4099c4cd85d1901f..2d9502efc25d1aaa23c5d04b3299edb83894c4ef 100644
--- a/bwa.wdl
+++ b/bwa.wdl
@@ -53,7 +53,7 @@ task index {
 
     output {
         File indexedFasta = outputFile
-        Array[File] indexFiles = [indexBase + ".bwt",indexBase + ".pac",indexBase + ".sa",indexBase + ".amb",indexBase + ".ann"]
+        Array[File] indexFiles = [outputFile + ".bwt",outputFile + ".pac",outputFile + ".sa",outputFile + ".amb",outputFile + ".ann"]
     }
     parameter_meta {
         fasta: "Fasta file to be indexed"