diff --git a/include/rapidjson/internal/biginteger.h b/include/rapidjson/internal/biginteger.h
index 5baba9b..99a30ac 100755
--- a/include/rapidjson/internal/biginteger.h
+++ b/include/rapidjson/internal/biginteger.h
@@ -97,7 +97,7 @@ public:
         if (u == 1) return *this;
         if (*this == 1) return *this = u;
 
-        uint32_t k = 0;
+        uint64_t k = 0;
         for (size_t i = 0; i < count_; i++) {
             const uint64_t c = digits_[i] >> 32;
             const uint64_t d = digits_[i] & 0xFFFFFFFF;
@@ -246,7 +246,7 @@ private:
         __extension__ typedef unsigned __int128 uint128;
         uint128 p = static_cast<uint128>(a) * static_cast<uint128>(b);
         p += k;
-        *outHigh = p >> 64;
+        *outHigh = static_cast<uint64_t>(p >> 64);
         return static_cast<uint64_t>(p);
 #else
         const uint64_t a0 = a & 0xFFFFFFFF, a1 = a >> 32, b0 = b & 0xFFFFFFFF, b1 = b >> 32;
diff --git a/include/rapidjson/internal/diyfp.h b/include/rapidjson/internal/diyfp.h
index 4ef53d9..3b6c423 100644
--- a/include/rapidjson/internal/diyfp.h
+++ b/include/rapidjson/internal/diyfp.h
@@ -45,7 +45,7 @@ struct DiyFp {
             uint64_t u64;
         } u = { d };
 
-        int biased_e = (u.u64 & kDpExponentMask) >> kDpSignificandSize;
+        int biased_e = static_cast<int>((u.u64 & kDpExponentMask) >> kDpSignificandSize);
         uint64_t significand = (u.u64 & kDpSignificandMask);
         if (biased_e != 0) {
             f = significand + kDpHiddenBit;
@@ -71,7 +71,7 @@ struct DiyFp {
 #elif (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) && defined(__x86_64__)
         __extension__ typedef unsigned __int128 uint128;
         uint128 p = static_cast<uint128>(f) * static_cast<uint128>(rhs.f);
-        uint64_t h = p >> 64;
+        uint64_t h = static_cast<uint64_t>(p >> 64);
         uint64_t l = static_cast<uint64_t>(p);
         if (l & (uint64_t(1) << 63)) // rounding
             h++;
diff --git a/include/rapidjson/internal/ieee754.h b/include/rapidjson/internal/ieee754.h
index e1e1008..e3f0336 100644
--- a/include/rapidjson/internal/ieee754.h
+++ b/include/rapidjson/internal/ieee754.h
@@ -36,7 +36,7 @@ public:
 
     bool Sign() const { return (u_ & kSignMask) != 0; }
     uint64_t Significand() const { return u_ & kSignificandMask; }
-    int Exponent() const { return ((u_ & kExponentMask) >> kSignificandSize) - kExponentBias; }
+    int Exponent() const { return static_cast<int>(((u_ & kExponentMask) >> kSignificandSize) - kExponentBias); }
 
     bool IsNan() const { return (u_ & kExponentMask) == kExponentMask && Significand() != 0; }
     bool IsInf() const { return (u_ & kExponentMask) == kExponentMask && Significand() == 0; }