diff --git a/reg-tests/compression/lua_validation.vtc b/reg-tests/compression/lua_validation.vtc
index 6e8c1e8..91a41a0 100644
--- a/reg-tests/compression/lua_validation.vtc
+++ b/reg-tests/compression/lua_validation.vtc
@@ -40,7 +40,7 @@
         HOST="\[::1\]"
     fi
 
-    md5=$(which md5 || which md5sum)
+    md5=$(command -v md5 || command -v md5sum)
 
     if [ -z $md5 ] ; then
         echo "MD5 checksum utility not found"