diff --git a/test/mooncake.jl b/test/mooncake.jl
index 1790ba4..e4bdcc6 100644
--- a/test/mooncake.jl
+++ b/test/mooncake.jl
@@ -62,6 +62,7 @@ end
         (Float32, Float64),
         (ComplexF64, ComplexF64),
         (Float64, ComplexF64),
+        (ComplexF64, Float64),
     )
     T = promote_type(T₁, T₂)
     atol = max(precision(T₁), precision(T₂))