diff --git a/Makefile b/Makefile
index a0b2f7bffc..63fd6932aa 100644
--- a/Makefile
+++ b/Makefile
@@ -34,6 +34,7 @@ EXCLUDE_TESTS += test^go^step5   # test completes, even at 100,000
 EXCLUDE_TESTS += test^php^step5  # test completes, even at 100,000
 EXCLUDE_TESTS += test^ruby^step5 # test completes, even at 100,000
 EXCLUDE_TESTS += test^rust^step5 # no catching stack overflows
+EXCLUDE_TESTS += test^ocaml^step5 # test completes, even at 1,000,000
 
 # interop tests now implemented yet
 EXCLUDE_TESTS += test^cs^stepA test^java^stepA test^mal^stepA \
diff --git a/ocaml/Makefile b/ocaml/Makefile
index bad3f60294..299b2c40b5 100644
--- a/ocaml/Makefile
+++ b/ocaml/Makefile
@@ -1,5 +1,5 @@
 STEPS = step0_repl.ml step1_read_print.ml step2_eval.ml step3_env.ml \
-        step4_if_fn_do.ml
+        step4_if_fn_do.ml step5_tco.ml
 MODULES = types.ml reader.ml printer.ml env.ml core.ml
 LIBS = str.cmxa
 MAL_LIB = mal_lib.cmxa
diff --git a/ocaml/step5_tco.ml b/ocaml/step5_tco.ml
new file mode 120000
index 0000000000..ab0ca0b0ce
--- /dev/null
+++ b/ocaml/step5_tco.ml
@@ -0,0 +1 @@
+step4_if_fn_do.ml
\ No newline at end of file