diff --git a/c/reg_test/expected/out b/c/reg_test/expected/out
index 91046854a..4e9694f6f 100644
--- a/c/reg_test/expected/out
+++ b/c/reg_test/expected/out
@@ -7538,6 +7538,19 @@ name.x 1
 name.y 2
 z      3
 
+mlr --opprint put $z = $x < 0.5 ? 0 : 1 ./reg_test/input/abixy
+a   b   i  x                   y                   z
+pan pan 1  0.3467901443380824  0.7268028627434533  0
+eks pan 2  0.7586799647899636  0.5221511083334797  1
+wye wye 3  0.20460330576630303 0.33831852551664776 0
+eks wye 4  0.38139939387114097 0.13418874328430463 0
+wye pan 5  0.5732889198020006  0.8636244699032729  1
+zee pan 6  0.5271261600918548  0.49322128674835697 1
+eks zee 7  0.6117840605678454  0.1878849191181694  1
+zee wye 8  0.5985540091064224  0.976181385699006   1
+hat wye 9  0.03144187646093577 0.7495507603507059  0
+pan wye 10 0.5026260055412137  0.9526183602969864  1
+
 
 ================================================================
 DSL NULL/EMPTY HANDLING
diff --git a/c/reg_test/run b/c/reg_test/run
index bb57e55b6..dcc09fc4f 100755
--- a/c/reg_test/run
+++ b/c/reg_test/run
@@ -689,6 +689,8 @@ run_mlr put '$z=max($x, $y)' $indir/minmax.dkvp
 run_mlr --icsvlite --oxtab put '${x+y} = ${name.x} + ${name.y}; ${x*y} = ${name.x} * ${name.y}' $indir/braced.csv
 run_mlr --icsvlite --oxtab filter '${name.y} < ${z}' $indir/braced.csv
 
+run_mlr --opprint put '$z = $x < 0.5 ? 0 : 1' $indir/abixy
+
 # ----------------------------------------------------------------
 announce DSL NULL/EMPTY HANDLING