diff --git a/crates/uplc/test_data/fibonacci/fibonacci.uplc b/crates/uplc/test_data/fibonacci/fibonacci.uplc
index b1683917..2e1f1174 100644
--- a/crates/uplc/test_data/fibonacci/fibonacci.uplc
+++ b/crates/uplc/test_data/fibonacci/fibonacci.uplc
@@ -2,7 +2,7 @@
   1.0.0
   [
     (lam
-      i0
+      i_0
       [
         [
           (force
@@ -10,13 +10,19 @@
               (delay
                 (delay
                   (lam
-                    f
+                    i_1
                     [
-                      (force (delay (lam s [ s s ])))
+                      (force (delay (lam i_2 [ i_2 i_2 ])))
                       (lam
-                        s
+                        i_3
                         (lam
-                          x [ [ f [ (force (delay (lam s [ s s ]))) s ] ] x ]
+                          i_4
+                          [
+                            [
+                              i_1 [ (force (delay (lam i_5 [ i_5 i_5 ]))) i_3 ]
+                            ]
+                            i_4
+                          ]
                         )
                       )
                     ]
@@ -26,22 +32,25 @@
             )
           )
           (lam
-            rec
+            i_6
             (lam
-              i
+              i_7
               [
                 [
                   [
                     (force
                       (delay
                         (lam
-                          b
+                          i_8
                           (lam
-                            x
+                            i_9
                             (lam
-                              y
+                              i_10
                               [
-                                [ [ [ (force (builtin ifThenElse)) b ] x ] y ]
+                                [
+                                  [ [ (force (builtin ifThenElse)) i_8 ] i_9 ]
+                                  i_10
+                                ]
                                 (con unit ())
                               ]
                             )
@@ -49,29 +58,32 @@
                         )
                       )
                     )
-                    [ [ (builtin lessThanEqualsInteger) i ] (con integer 1) ]
+                    [ [ (builtin lessThanEqualsInteger) i_7 ] (con integer 1) ]
                   ]
-                  (lam u i)
+                  (lam i_11 i_7)
                 ]
                 (lam
-                  u
+                  i_12
                   [
                     [
                       (builtin addInteger)
                       [
-                        rec [ [ (builtin subtractInteger) i ] (con integer 1) ]
+                        i_6
+                        [ [ (builtin subtractInteger) i_7 ] (con integer 1) ]
                       ]
                     ]
-                    [ rec [ [ (builtin subtractInteger) i ] (con integer 2) ] ]
+                    [
+                      i_6 [ [ (builtin subtractInteger) i_7 ] (con integer 2) ]
+                    ]
                   ]
                 )
               ]
             )
           )
         ]
-        i0
+        i_0
       ]
     )
     (con integer 0)
   ]
-)
+)
\ No newline at end of file
diff --git a/crates/uplc/test_data/fibonacci/unsanitary_fibonacci.uplc b/crates/uplc/test_data/fibonacci/unsanitary_fibonacci.uplc
new file mode 100644
index 00000000..b1683917
--- /dev/null
+++ b/crates/uplc/test_data/fibonacci/unsanitary_fibonacci.uplc
@@ -0,0 +1,77 @@
+(program
+  1.0.0
+  [
+    (lam
+      i0
+      [
+        [
+          (force
+            (force
+              (delay
+                (delay
+                  (lam
+                    f
+                    [
+                      (force (delay (lam s [ s s ])))
+                      (lam
+                        s
+                        (lam
+                          x [ [ f [ (force (delay (lam s [ s s ]))) s ] ] x ]
+                        )
+                      )
+                    ]
+                  )
+                )
+              )
+            )
+          )
+          (lam
+            rec
+            (lam
+              i
+              [
+                [
+                  [
+                    (force
+                      (delay
+                        (lam
+                          b
+                          (lam
+                            x
+                            (lam
+                              y
+                              [
+                                [ [ [ (force (builtin ifThenElse)) b ] x ] y ]
+                                (con unit ())
+                              ]
+                            )
+                          )
+                        )
+                      )
+                    )
+                    [ [ (builtin lessThanEqualsInteger) i ] (con integer 1) ]
+                  ]
+                  (lam u i)
+                ]
+                (lam
+                  u
+                  [
+                    [
+                      (builtin addInteger)
+                      [
+                        rec [ [ (builtin subtractInteger) i ] (con integer 1) ]
+                      ]
+                    ]
+                    [ rec [ [ (builtin subtractInteger) i ] (con integer 2) ] ]
+                  ]
+                )
+              ]
+            )
+          )
+        ]
+        i0
+      ]
+    )
+    (con integer 0)
+  ]
+)
diff --git a/crates/uplc/tests/integ_tests.rs b/crates/uplc/tests/integ_tests.rs
index 008be5dd..c6418236 100644
--- a/crates/uplc/tests/integ_tests.rs
+++ b/crates/uplc/tests/integ_tests.rs
@@ -72,4 +72,12 @@ fn fibonacci() {
     let code = include_str!("../test_data/fibonacci/fibonacci.uplc");
 
     round_trip_test(bytes, code);
+}
+
+#[test]
+fn one_way_fibonacci() {
+    let bytes = include_bytes!("../test_data/fibonacci/fibonacci.flat");
+    let code = include_str!("../test_data/fibonacci/unsanitary_fibonacci.uplc");
+
+    parsed_program_matches_decoded_bytes(bytes, code);
 }
\ No newline at end of file