diff --git a/skimage/util/tests/test_dtype.py b/skimage/util/tests/test_dtype.py
index 9597c784..2ef0044f 100644
--- a/skimage/util/tests/test_dtype.py
+++ b/skimage/util/tests/test_dtype.py
@@ -69,6 +69,13 @@ def test_unsupported_dtype():
     assert_raises(ValueError, img_as_int, x)
 
 
+def test_float_out_of_range():
+    too_high = np.array([2], dtype=np.float32)
+    assert_raises(ValueError, img_as_int, too_high)
+    too_low = np.array([-2], dtype=np.float32)
+    assert_raises(ValueError, img_as_int, too_low)
+
+
 def test_copy():
     x = np.array([1], dtype=np.float64)
     y = img_as_float(x)