diff --git a/examples/notebooks/teardown.jl b/examples/notebooks/teardown.jl
index c3843a5..b0fc5b9 100644
--- a/examples/notebooks/teardown.jl
+++ b/examples/notebooks/teardown.jl
@@ -86,6 +86,9 @@ end
 # ╔═╡ 04894092-b9c4-42d8-87b2-b530de95736c
 returns
 
+# ╔═╡ 2a8b580d-349a-4766-baba-c3b48622084f
+returns.coredata
+
 # ╔═╡ Cell order:
 # ╠═a1861f50-046e-11ef-348b-cb9f60ea0d1b
 # ╠═accbd5bc-4976-48cf-91c1-e12b62a94edf
@@ -98,3 +101,4 @@ returns
 # ╠═ac56bb3d-0732-4536-bb81-594643c31935
 # ╠═c61cb98d-b0ea-4bf5-a0b4-11b925b18e0d
 # ╠═04894092-b9c4-42d8-87b2-b530de95736c
+# ╠═2a8b580d-349a-4766-baba-c3b48622084f
diff --git a/src/cumulative_return.jl b/src/cumulative_return.jl
index c1fc1de..1887bcc 100644
--- a/src/cumulative_return.jl
+++ b/src/cumulative_return.jl
@@ -13,7 +13,7 @@ mutable struct CumulativeReturn{T} <: PortfolioAnalyticsSingleOutput{T}
 
     function CumulativeReturn{T}() where {T}
         val = zero(T)
-        p = Prod()
+        p = Prod(T)
         new{T}(val, 0, p)
     end
 end