diff --git a/src/fusiontrees/fusiontrees.jl b/src/fusiontrees/fusiontrees.jl
index 13710ee5b..c16f4191c 100644
--- a/src/fusiontrees/fusiontrees.jl
+++ b/src/fusiontrees/fusiontrees.jl
@@ -214,6 +214,7 @@ function Base.hash(f::FusionTree{I}, h::UInt) where {I}
     end
     return h
 end
+Base.hash(b::FusionTreeBlock, h::UInt) = hash(fusiontrees(b), h)
 function Base.:(==)(f₁::FusionTree{I, N}, f₂::FusionTree{I, N}) where {I <: Sector, N}
     f₁.coupled == f₂.coupled || return false
     @inbounds for i in 1:N