diff --git a/src/problems/basic_problems.jl b/src/problems/basic_problems.jl
index 90f5bfefa..dd94f21a0 100644
--- a/src/problems/basic_problems.jl
+++ b/src/problems/basic_problems.jl
@@ -416,7 +416,7 @@ IntegralProblem(y,x;
 
 The fields match the names of the constructor arguments.
 """
-struct IntegralDataProblem{Y<:AbstractArray, X<:AbstractVector, DIMVAL} <: AbstractIntegralProblem{false}
+struct IntegralDataProblem{Y<:AbstractArray, X<:AbstractVector, DIMVAL, K} <: AbstractIntegralProblem{false}
     x::X
     y::Y
     dim::DIMVAL