diff --git a/src/PolyhedralGeometry/iterators.jl b/src/PolyhedralGeometry/iterators.jl
index 800cd2495352..f8ab731dbecd 100644
--- a/src/PolyhedralGeometry/iterators.jl
+++ b/src/PolyhedralGeometry/iterators.jl
@@ -93,22 +93,19 @@ function Base.:(==)(x::RayVector, y::RayVector)
   ix == iy || return false
   isnothing(ix) && return true
   r = ay[iy]//ax[ix]
+  r < zero(r) && return false
   return (r .* ax == ay)
 end
 
 function Base.:(==)(x::RayVector, y::AbstractVector)
-  try
-    ry = ray_vector(coefficient_field(x), y)
-    return x == ry
-  catch
-    return false
-  end
+  ry = ray_vector(coefficient_field(x), y)
+  return x == ry
 end
 
 Base.:(==)(x::AbstractVector, y::RayVector) = y == x
 
-Base.:(==)(::PointVector, ::RayVector) = false
-Base.:(==)(::RayVector, ::PointVector) = false
+Base.:(==)(::PointVector, ::RayVector) = throw(ArgumentError("Cannot compare PointVector to RayVector"))
+Base.:(==)(::RayVector, ::PointVector) = throw(ArgumentError("Cannot compare PointVector to RayVector"))
 
 ################################################################################
 ######## Halfspaces and Hyperplanes
diff --git a/test/PolyhedralGeometry/types.jl b/test/PolyhedralGeometry/types.jl
index 3b60977be5a0..ada8376422c7 100644
--- a/test/PolyhedralGeometry/types.jl
+++ b/test/PolyhedralGeometry/types.jl
@@ -59,7 +59,7 @@
           @test *(g(3), A) == 3 * a
 
           let Ao = other(g, a)
-            @test A != Ao
+            @test_throws ArgumentError A == Ao
           end
         end
 
@@ -77,6 +77,9 @@
           @test 5 * A == A
           @test fun(f, 5 * a) == A
           @test A == fun(f, 5 * a)
+          @test -5 * A != A
+          @test fun(f, -5 * a) != A
+          @test A != fun(f, -5 * a)
         end
 
         if f != ENF