diff --git a/include/rapidjson/internal/biginteger.h b/include/rapidjson/internal/biginteger.h
index 99a30ac..e06e7e0 100755
--- a/include/rapidjson/internal/biginteger.h
+++ b/include/rapidjson/internal/biginteger.h
@@ -19,6 +19,7 @@
 
 #if defined(_MSC_VER) && defined(_M_AMD64)
 #include <intrin.h> // for _umul128
+#pragma intrinsic(_umul128)
 #endif
 
 RAPIDJSON_NAMESPACE_BEGIN
diff --git a/include/rapidjson/internal/diyfp.h b/include/rapidjson/internal/diyfp.h
index 3b6c423..d01bbe8 100644
--- a/include/rapidjson/internal/diyfp.h
+++ b/include/rapidjson/internal/diyfp.h
@@ -24,6 +24,7 @@
 #if defined(_MSC_VER) && defined(_M_AMD64)
 #include <intrin.h>
 #pragma intrinsic(_BitScanReverse64)
+#pragma intrinsic(_umul128)
 #endif
 
 RAPIDJSON_NAMESPACE_BEGIN