diff --git a/userspace/digwatch/lua/parser-smoke.sh b/userspace/digwatch/lua/parser-smoke.sh
index 96ebcd65..d6dc1833 100755
--- a/userspace/digwatch/lua/parser-smoke.sh
+++ b/userspace/digwatch/lua/parser-smoke.sh
@@ -15,12 +15,12 @@ function error_exit_bad
 
 function good
 {
-    lua test.lua "a: x.y=1; b: a and z.x exists; c: b; $1" 2> /dev/null || error_exit_good "$1"
+    lua5.1 test.lua "a: x.y=1; b: a and z.x exists; c: b; $1" 2> /dev/null || error_exit_good "$1"
 }
 
 function bad
 {
-    lua test.lua "a: x.y=1; b: a and z.x exists; c: b; $1" 2> /dev/null && error_exit_bad "$1"
+    lua5.1 test.lua "a: x.y=1; b: a and z.x exists; c: b; $1" 2> /dev/null && error_exit_bad "$1"
 }
 
 # Filters