diff --git a/gtsam/linear/tests/testGaussianBayesNet.cpp b/gtsam/linear/tests/testGaussianBayesNet.cpp
index 6e45765410..587597cf14 100644
--- a/gtsam/linear/tests/testGaussianBayesNet.cpp
+++ b/gtsam/linear/tests/testGaussianBayesNet.cpp
@@ -188,7 +188,7 @@ TEST(GaussianBayesNet, sample) {
   EXPECT_LONGS_EQUAL(2, actual.size());
 
   // regressions
-#ifdef __APPLE__ || _WIN32
+#if __APPLE__ || _WIN32
   EXPECT(assert_equal(Vector2(20.0129382, 40.0039798), actual[X(1)], 1e-5));
   EXPECT(assert_equal(Vector2(110.032083, 230.039811), actual[X(0)], 1e-5));
 #elif __linux__