diff --git a/tests/stdlib_test.cpp b/tests/stdlib_test.cpp
index fc0f0e1..978a60f 100644
--- a/tests/stdlib_test.cpp
+++ b/tests/stdlib_test.cpp
@@ -42,7 +42,7 @@
   EXPECT_EQ(902267124, lrand48());
   EXPECT_EQ(132366131, lrand48());
 
-#if __BIONIC__
+#if defined(__BIONIC__)
   // On bionic, random(3) is equivalent to lrand48...
   srandom(0x01020304);
   EXPECT_EQ(1409163720, random());