diff --git a/tests/dune_hello/Makefile b/tests/dune_hello/Makefile
index 84107aea18d..99e2277ff37 100644
--- a/tests/dune_hello/Makefile
+++ b/tests/dune_hello/Makefile
@@ -13,6 +13,8 @@ bin/hello.exe: Hello.ml
 .PHONY: run
 run: bin/hello.exe
 	./bin/hello.exe | grep "Hi!"
+	# Find a way to install this? dune install skips the bytecode
+	$(FSTAR_EXE) --ocamlenv dune exec ./hello.bc | grep "Hi!"
 
 clean:
 	dune clean
diff --git a/tests/dune_hello/dune b/tests/dune_hello/dune
index 86f94bf3049..e1bb73c8a6b 100644
--- a/tests/dune_hello/dune
+++ b/tests/dune_hello/dune
@@ -2,5 +2,8 @@
  (name hello)
  (public_name hello.exe)
  (libraries fstar.lib)
- (modes native)
+ (modes native byte)
 )
+(env
+  (_
+    (flags (:standard -w -A))))
diff --git a/tests/simple_hello/Makefile b/tests/simple_hello/Makefile
index 14bfea61f9b..728af2a84e2 100644
--- a/tests/simple_hello/Makefile
+++ b/tests/simple_hello/Makefile
@@ -6,14 +6,18 @@ FSTAR ?= ../../bin/fstar.exe
 
 all: Hello.test
 
-Hello.test: Hello.exe
-	./Hello.exe | grep "Hello F\*!"
+Hello.test: Hello.exe Hello.byte
+	./Hello.exe  | grep "Hello F\*!"
+	./Hello.byte | grep "Hello F\*!"
 
 %.ml: %.fst
 	$(FSTAR) --codegen OCaml $< --extract $*
 
 %.exe: %.ml
+	$(FSTAR) --ocamlopt $< -o $@
+
+%.byte: %.ml
 	$(FSTAR) --ocamlc $< -o $@
 
 clean:
-	rm -f *.ml *.exe
+	rm -f *.ml *.exe *.byte