diff --git a/include/boost/multiprecision/mpfi.hpp b/include/boost/multiprecision/mpfi.hpp
index b2b370c6..e0c628fe 100644
--- a/include/boost/multiprecision/mpfi.hpp
+++ b/include/boost/multiprecision/mpfi.hpp
@@ -477,7 +477,7 @@ inline void eval_subtract(mpfi_float_backend<D1>& result, const mpfi_float_backe
 template <unsigned D1, unsigned D2>
 inline void eval_multiply(mpfi_float_backend<D1>& result, const mpfi_float_backend<D2>& o)
 {
-   if(&result == &o)
+   if((void*)&result == (void*)&o)
       mpfi_sqr(result.data(), o.data());
    else
       mpfi_mul(result.data(), result.data(), o.data());
@@ -612,7 +612,7 @@ inline void eval_subtract(mpfi_float_backend<D1>& a, long x, const mpfi_float_ba
 template <unsigned D1, unsigned D2, unsigned D3>
 inline void eval_multiply(mpfi_float_backend<D1>& a, const mpfi_float_backend<D2>& x, const mpfi_float_backend<D3>& y)
 {
-   if(&x == &y)
+   if((void*)&x == (void*)&y)
       mpfi_sqr(a.data(), x.data());
    else
       mpfi_mul(a.data(), x.data(), y.data());
diff --git a/include/boost/multiprecision/mpfr.hpp b/include/boost/multiprecision/mpfr.hpp
index da864fb4..0449cbe8 100644
--- a/include/boost/multiprecision/mpfr.hpp
+++ b/include/boost/multiprecision/mpfr.hpp
@@ -952,7 +952,7 @@ inline void eval_subtract(mpfr_float_backend<D1, A1>& result, const mpfr_float_b
 template <unsigned D1, unsigned D2, mpfr_allocation_type A1, mpfr_allocation_type A2>
 inline void eval_multiply(mpfr_float_backend<D1, A1>& result, const mpfr_float_backend<D2, A2>& o)
 {
-   if(&o == &result)
+   if((void*)&o == (void*)&result)
       mpfr_sqr(result.data(), o.data(), GMP_RNDN);
    else
       mpfr_mul(result.data(), result.data(), o.data(), GMP_RNDN);
@@ -1087,7 +1087,7 @@ inline void eval_subtract(mpfr_float_backend<D1, A1>& a, long x, const mpfr_floa
 template <unsigned D1, unsigned D2, mpfr_allocation_type A1, mpfr_allocation_type A2, unsigned D3>
 inline void eval_multiply(mpfr_float_backend<D1, A1>& a, const mpfr_float_backend<D2, A2>& x, const mpfr_float_backend<D3>& y)
 {
-   if(&x == &y)
+   if((void*)&x == (void*)&y)
       mpfr_sqr(a.data(), x.data(), GMP_RNDN);
    else
       mpfr_mul(a.data(), x.data(), y.data(), GMP_RNDN);