diff --git a/libcxx/test/std/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp b/libcxx/test/std/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp
--- a/libcxx/test/std/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp
+++ b/libcxx/test/std/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp
@@ -51,8 +51,8 @@
     // we should expect. In most cases it should be 8. But in i386 builds
     // with Clang >= 8 or GCC >= 8 the value is '4'.
     test_alignment_of<double, TEST_ALIGNOF(double)>();
-#if (defined(__ppc__) && !defined(__ppc64__))
-    test_alignment_of<bool, 4>();   // 32-bit PPC has four byte bool
+#if (defined(__ppc__) && !defined(__ppc64__) && !defined(_AIX))
+    test_alignment_of<bool, 4>();   // 32-bit PPC has four byte bool, except on AIX.
 #else
     test_alignment_of<bool, 1>();
 #endif