diff --git a/src/corelib/tools/qsimd_p.h b/src/corelib/tools/qsimd_p.h
index 44428b7284..b53df00b65 100644
--- a/src/corelib/tools/qsimd_p.h
+++ b/src/corelib/tools/qsimd_p.h
@@ -44,24 +44,8 @@
 
 #include <qglobal.h>
 
-
 QT_BEGIN_HEADER
 
-
-#if defined(QT_NO_MAC_XARCH) || (defined(Q_OS_DARWIN) && (defined(__ppc__) || defined(__ppc64__)))
-// Disable MMX and SSE on Mac/PPC builds, or if the compiler
-// does not support -Xarch argument passing
-#undef QT_HAVE_SSE
-#undef QT_HAVE_SSE2
-#undef QT_HAVE_SSE3
-#undef QT_HAVE_SSSE3
-#undef QT_HAVE_SSE4_1
-#undef QT_HAVE_SSE4_2
-#undef QT_HAVE_AVX
-#undef QT_HAVE_3DNOW
-#undef QT_HAVE_MMX
-#endif
-
 #ifdef __MINGW64_VERSION_MAJOR
 #include <intrin.h>
 #endif