diff --git a/Modules/_decimal/libmpdec/typearith.h b/Modules/_decimal/libmpdec/typearith.h
index d0aaaeb1e59792..405237dac516ad 100644
--- a/Modules/_decimal/libmpdec/typearith.h
+++ b/Modules/_decimal/libmpdec/typearith.h
@@ -525,31 +525,6 @@ _mpd_div_words(mpd_uint_t *q, mpd_uint_t *r, mpd_uint_t hi, mpd_uint_t lo,
     *r = rr;
 }
 /* END MASM (_MSC_VER) */
-#elif defined _M_ARM
-static inline void __cdecl
-_mpd_mul_words(mpd_uint_t *hi, mpd_uint_t *lo, mpd_uint_t a, mpd_uint_t b)
-{
-    uint64_t aa = a;
-    uint64_t bb = b;
-    uint64_t result = aa * bb;
-
-    *lo = (mpd_uint_t)result & 0xFFFFFFFF;
-    *hi = (mpd_uint_t)(result >> 32) & 0xFFFFFFFF;
-}
-
-static inline void __cdecl
-_mpd_div_words(mpd_uint_t *q, mpd_uint_t *r, mpd_uint_t hi, mpd_uint_t lo,
-    mpd_uint_t d)
-{
-    uint64_t numerator = (((uint64_t)hi) << 32) | ((uint64_t)lo);
-    uint64_t denominator = d;
-    uint64_t quotient = numerator / denominator;
-    uint64_t remainder = numerator % denominator;
-
-    *q = (mpd_uint_t)quotient;
-    *r = (mpd_uint_t)remainder;
-}
-
 #else
   #error "need platform specific 64 bit multiplication and division"
 #endif