diff --git a/utils/prometheus/test.sh b/utils/prometheus/test.sh
index 54266ab4c5..2089454626 100644
--- a/utils/prometheus/test.sh
+++ b/utils/prometheus/test.sh
@@ -1,3 +1,3 @@
 #!/bin/sh
 
-prometheus --version 2>&1 | grep "${2%%-*}"
+prometheus --version 2>&1 | grep "$2"