diff --git a/src/autorange.jl b/src/autorange.jl
index ad4de2e..b21ee7e 100644
--- a/src/autorange.jl
+++ b/src/autorange.jl
@@ -12,7 +12,7 @@ function autorange(R::CartesianRange, tform)
         mn = map(min, x, mn)
         mx = map(max, x, mx)
     end
-    _autorange(convert(Tuple, mn), convert(Tuple, mx))
+    _autorange(Tuple(mn), Tuple(mx))
 end
 
 @noinline _autorange(mn,mx) = map((a,b)->floor(Int,a):ceil(Int,b), mn, mx)
diff --git a/test/autorange.jl b/test/autorange.jl
index e4dbe4f..2258671 100644
--- a/test/autorange.jl
+++ b/test/autorange.jl
@@ -126,4 +126,10 @@ end
             @test rnge[2].stop  ==  ceil(sin(ϕ)*last(indh)  + cos(ϕ)*last(indw))
         end
     end
+    #should also work with non-static transforms (Github #48)
+    tfm = LinearMap(eye(2))
+    tfm_s = LinearMap(SMatrix{2,2}(eye(2)))
+    tst_img = zeros(5,5)
+    rnge = ImageTransformations.autorange(tst_img, tfm_s)
+    @test rnge == ImageTransformations.autorange(tst_img, tfm)
 end