diff --git a/src/HPolyhedron.jl b/src/HPolyhedron.jl
index 96fcf8bfef..45c75b4135 100644
--- a/src/HPolyhedron.jl
+++ b/src/HPolyhedron.jl
@@ -152,7 +152,7 @@ function σ(d::AbstractVector{N}, P::HPoly{N}) where {N<:Real}
 end
 
 @inline function _to_minus_vector(d::SparseVector{N}) where {N}
-    c = zeros(length(d))
+    c = zeros(N, length(d))
     for (ni, i) in enumerate(d.nzind)
         @inbounds c[i] = -d.nzval[ni]
     end