diff --git a/src/definitions.jl b/src/definitions.jl
index e02de62..6c808d9 100644
--- a/src/definitions.jl
+++ b/src/definitions.jl
@@ -582,7 +582,9 @@ plan_brfft
 
 struct NoProjectionStyle end
 struct RealProjectionStyle end 
-struct RealInverseProjectionStyle end
+struct RealInverseProjectionStyle 
+    dim::Int
+end
 const ProjectionStyle = Union{NoProjectionStyle, RealProjectionStyle, RealInverseProjectionStyle}
 
 function irfft_dim end
@@ -590,7 +592,7 @@ function irfft_dim end
 output_size(p::Plan) = _output_size(p, ProjectionStyle(p))
 _output_size(p::Plan, ::NoProjectionStyle) = size(p)
 _output_size(p::Plan, ::RealProjectionStyle) = rfft_output_size(size(p), region(p))
-_output_size(p::Plan, ::RealInverseProjectionStyle) = brfft_output_size(size(p), irfft_dim(p), region(p))
+_output_size(p::Plan, s::RealInverseProjectionStyle) = brfft_output_size(size(p), s.dim, region(p))
 
 mutable struct AdjointPlan{T,P<:Plan} <: Plan{T}
     p::P
diff --git a/test/testplans.jl b/test/testplans.jl
index b39c7ea..efb7d69 100644
--- a/test/testplans.jl
+++ b/test/testplans.jl
@@ -112,8 +112,7 @@ mutable struct InverseTestRPlan{T,N,G} <: Plan{T}
 end
 
 AbstractFFTs.ProjectionStyle(::TestRPlan) = AbstractFFTs.RealProjectionStyle()
-AbstractFFTs.ProjectionStyle(::InverseTestRPlan) = AbstractFFTs.RealInverseProjectionStyle()
-AbstractFFTs.irfft_dim(p::InverseTestRPlan) = p.d
+AbstractFFTs.ProjectionStyle(p::InverseTestRPlan) = AbstractFFTs.RealInverseProjectionStyle(p.d)
 
 function AbstractFFTs.plan_rfft(x::AbstractArray{T}, region; kwargs...) where {T}
     return TestRPlan{T}(region, size(x))