--- a/src/third_party/mozjs/extract/mozglue/misc/SIMD.cpp
+++ b/src/third_party/mozjs/extract/mozglue/misc/SIMD.cpp
@@ -448,16 +448,8 @@
 // assertion failure. Accordingly, we just don't allow that to happen. We
 // are not particularly concerned about ensuring that newer 32 bit processors
 // get access to the AVX2 functions exposed here.
-#  if defined(MOZILLA_MAY_SUPPORT_AVX2) && defined(__x86_64__)
-
-bool SupportsAVX2() { return supports_avx2(); }
-
-#  else
-
 bool SupportsAVX2() { return false; }

-#  endif
-
 const char* SIMD::memchr8(const char* ptr, char value, size_t length) {
   if (SupportsAVX2()) {
     return memchr8AVX2(ptr, value, length);