diff --git a/libc/test/include/SignbitTest.h b/libc/test/include/SignbitTest.h
index 85d499823088c0..d0686d45d3985b 100644
--- a/libc/test/include/SignbitTest.h
+++ b/libc/test/include/SignbitTest.h
@@ -23,7 +23,7 @@ template <typename T> class SignbitTest : public LIBC_NAMESPACE::testing::Test {
 
   void testSpecialNumbers(SignbitFunc func) {
     EXPECT_EQ(func(1), 0);
-    EXPECT_EQ(func(-1), 1);
+    EXPECT_NE(func(-1), 0);
   }
 };