diff --git a/test/basics.jl b/test/basics.jl
index 05da844cd..f40da5e2d 100644
--- a/test/basics.jl
+++ b/test/basics.jl
@@ -312,6 +312,9 @@ end
     @syms a b c
     @test isequal(a + b, a + b + 0.01 - 0.01)
     @test isequal(a + NaN, a + NaN)
+
+    @test !isequal(a, missing)
+    @test !isequal(missing, b)
 end
 
 @testset "subtyping" begin