diff --git a/bin/tests/system/unknown/tests.sh b/bin/tests/system/unknown/tests.sh
index f0f8e8fbcb..69d7871521 100644
--- a/bin/tests/system/unknown/tests.sh
+++ b/bin/tests/system/unknown/tests.sh
@@ -174,14 +174,14 @@ status=`expr $status + $ret`
 
 echo "I:check that '"'"\\#"'"' is not treated as the unknown escape sequence"
 ret=0
-DIG $DIGOPTS @10.53.0.1 +tcp +short txt8.example txt > dig.out
+$DIG $DIGOPTS @10.53.0.1 +tcp +short txt8.example txt > dig.out
 echo '"#" "2" "0145"' | diff - dig.out || ret=1
 [ $ret = 0 ] || echo "I: failed"
 status=`expr $status + $ret`
 
 echo "I:check that '"'TXT \# text'"' is not treated as the unknown escape sequence"
 ret=0
-DIG $DIGOPTS @10.53.0.1 +tcp +short txt9.example txt > dig.out
+$DIG $DIGOPTS @10.53.0.1 +tcp +short txt9.example txt > dig.out
 echo '"#" "text"' | diff - dig.out || ret=1
 [ $ret = 0 ] || echo "I: failed"
 status=`expr $status + $ret`