diff --git a/tests/run/numpy_math.pyx b/tests/run/numpy_math.pyx
index eafd23a..4a15522 100644
--- a/tests/run/numpy_math.pyx
+++ b/tests/run/numpy_math.pyx
@@ -37,8 +37,8 @@ def test_fp_classif():
     assert not npmath.isnan(d_zero)
     assert not npmath.isnan(f_zero)
 
-    assert npmath.isinf(npmath.INFINITY) == 1
-    assert npmath.isinf(-npmath.INFINITY) == -1
+    assert npmath.isinf(npmath.INFINITY) != 0
+    assert npmath.isinf(-npmath.INFINITY) != 0
     assert npmath.isnan(npmath.NAN)
 
     assert npmath.signbit(npmath.copysign(1., -1.))