diff --git a/modules/tiddit/sv/main.nf b/modules/tiddit/sv/main.nf
index 1bf7146a..b3e3813c 100644
--- a/modules/tiddit/sv/main.nf
+++ b/modules/tiddit/sv/main.nf
@@ -24,7 +24,7 @@ process TIDDIT_SV {
     script:
     def args = task.ext.args ?: ''
     def prefix = task.ext.prefix ?: "${meta.id}"
-    def reference = fasta == "dummy_file.txt" ? "--ref $fasta" : ""
+    def reference = fasta ? "--ref $fasta" : ""
     """
     tiddit \\
         --sv \\
diff --git a/tests/modules/tiddit/sv/test.yml b/tests/modules/tiddit/sv/test.yml
index 168d21c5..40ea5b4d 100644
--- a/tests/modules/tiddit/sv/test.yml
+++ b/tests/modules/tiddit/sv/test.yml
@@ -9,6 +9,7 @@
     - path: output/tiddit/test.signals.tab
       md5sum: dab4b2fec4ddf8eb1c23005b0770150e
     - path: output/tiddit/test.vcf
+      md5sum: bdce14ae8292bf3deb81f6f255baf859
 
 - name: tiddit sv no ref
   command: nextflow run ./tests/modules/tiddit/sv -entry test_tiddit_sv_no_ref -c ./tests/config/nextflow.config -c ./tests/modules/tiddit/sv/nextflow.config
@@ -21,3 +22,4 @@
     - path: output/tiddit/test.signals.tab
       md5sum: dab4b2fec4ddf8eb1c23005b0770150e
     - path: output/tiddit/test.vcf
+      md5sum: 3d0e83a8199b2bdb81cfe3e6b12bf64b