diff --git a/test/runtests.jl b/test/runtests.jl
index 0ff9df3..e50c813 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -7,5 +7,5 @@ using Core.Compiler: IRCode
     ir = Base.code_ircode_by_type(Tuple{typeof(sin), Float64})[1][1]
     oc = OpaqueClosure(ir; do_compile=true)
     mc = MistyClosure(oc, ir)
-    @test mc(5.0) == sin(5.0)
+    @test @inferred(mc(5.0)) == sin(5.0)
 end