diff --git a/src/tests.sh b/src/tests.sh
index eab3e6e..fd0ff11 100755
--- a/src/tests.sh
+++ b/src/tests.sh
@@ -193,6 +193,7 @@ endBlock
 title "Forbble"
 check "BasicForbbleOp" "(loadfile 'examples/forbble.pbl') (feval (10 10 * .)) ''" "100"
 check "FibForbble" "(loadfile 'examples/forbble.pbl') (feval (1 1 _f _f _f _f _f _f _f _f _f _f _f _f _f _f _f _f _f _f _f _f _f .)) ''" "28657"
+check "ForbbleDefine" "(loadfile 'examples/forbble.pbl') (feval ( : \"cubed\" dup dup * * $ )) (feval (4 cubed .)) ''" "64"
 endBlock
 
 # title "Environment"