diff --git a/src/lofreq/call/test.sh b/src/lofreq/call/test.sh
index ccd8100c..457687d3 100644
--- a/src/lofreq/call/test.sh
+++ b/src/lofreq/call/test.sh
@@ -14,4 +14,7 @@ echo "> Run lofreq call"
 echo ">> Checking output"
 [ ! -f "output.vcf" ] && echo "Output file output.vcf does not exist" && exit 1
 
+echo ">> Check if output is empty"
+[ ! -s "output.vcf" ] && echo "Output file output.vcf is empty" && exit 1
+
 echo "> Test successful"
\ No newline at end of file