diff --git a/test/with_logabsdet_jacobian.jl b/test/with_logabsdet_jacobian.jl
index f69125d..d5f4484 100644
--- a/test/with_logabsdet_jacobian.jl
+++ b/test/with_logabsdet_jacobian.jl
@@ -24,10 +24,10 @@
     dlog1mlogistic(x) = -logistic(x)
     dlogitexp(x) = inv(1 - exp(x))
     dlogit1mexp(x) = -inv(1 - exp(x))
-    derivative(::Type{loglogistic}, x) = dloglogistic(x)
-    derivative(::Type{log1mlogistic}, x) = dlog1mlogistic(x)
-    derivative(::Type{logitexp}, x) = dlogitexp(x)
-    derivative(::Type{logit1mexp}, x) = dlogit1mexp(x)
+    derivative(f::typeof(loglogistic), x) = dloglogistic(x)
+    derivative(f::typeof(log1mlogistic), x) = dlog1mlogistic(x)
+    derivative(f::typeof(logitexp), x) = dlogitexp(x)
+    derivative(f::typeof(logit1mexp), x) = dlogit1mexp(x)
 
     ChangesOfVariables.test_with_logabsdet_jacobian(loglogistic, x, derivative)
     ChangesOfVariables.test_with_logabsdet_jacobian(logitexp, -x, derivative)