diff --git a/conf/test_index.config b/conf/test_index.config
index 64ae5766..bb9f4707 100644
--- a/conf/test_index.config
+++ b/conf/test_index.config
@@ -23,7 +23,7 @@ params {
 
     input            = 'https://github.com/nf-core/test-datasets/raw/smrnaseq/samplesheet/v2.0/samplesheet.csv'
     fasta            = 'https://github.com/nf-core/test-datasets/raw/smrnaseq/reference/genome.fa'
-    bowtie_index     = 'https://github.com/nf-core/test-datasets/raw/smrnaseq/reference/'
+    bowtie_index     = 'https://github.com/nf-core/test-datasets/raw/smrnaseq/reference/bowtie_index.tar.gz'
 
     mirtrace_species         = 'hsa'
     protocol                 = 'illumina'