diff --git a/src/dynarmic/backend/x64/emit_x64_vector_floating_point.cpp b/src/dynarmic/backend/x64/emit_x64_vector_floating_point.cpp
index 1c313095..8ce25004 100644
--- a/src/dynarmic/backend/x64/emit_x64_vector_floating_point.cpp
+++ b/src/dynarmic/backend/x64/emit_x64_vector_floating_point.cpp
@@ -1421,8 +1421,6 @@ void EmitX64::EmitFPVectorRecipStepFused64(EmitContext& ctx, IR::Inst* inst) {
 
 template<size_t fsize>
 void EmitFPVectorRoundInt(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
-    using FPT = mcl::unsigned_integer_of_size<fsize>;
-
     const auto rounding = static_cast<FP::RoundingMode>(inst->GetArg(1).GetU8());
     const bool exact = inst->GetArg(2).GetU1();
 
@@ -1461,6 +1459,7 @@ void EmitFPVectorRoundInt(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
 
     static const auto lut = Common::GenerateLookupTableFromList(
         []<typename I>(I) {
+            using FPT = mcl::unsigned_integer_of_size<fsize>;  // WORKAROUND: For issue 678 on MSVC
             return std::pair{
                 mp::lower_to_tuple_v<I>,
                 Common::FptrCast(
@@ -1708,8 +1707,6 @@ void EmitX64::EmitFPVectorToHalf32(EmitContext& ctx, IR::Inst* inst) {
 
 template<size_t fsize, bool unsigned_>
 void EmitFPVectorToFixed(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
-    using FPT = mcl::unsigned_integer_of_size<fsize>;
-
     const size_t fbits = inst->GetArg(1).GetU8();
     const auto rounding = static_cast<FP::RoundingMode>(inst->GetArg(2).GetU8());
     [[maybe_unused]] const bool fpcr_controlled = inst->GetArg(3).GetU1();
@@ -1812,6 +1809,7 @@ void EmitFPVectorToFixed(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
                         FCODE(orp)(src, exceed_unsigned);
                     }
                 } else {
+                    using FPT = mcl::unsigned_integer_of_size<fsize>;  // WORKAROUND: For issue 678 on MSVC
                     constexpr u64 integer_max = static_cast<FPT>(std::numeric_limits<std::conditional_t<unsigned_, FPT, std::make_signed_t<FPT>>>::max());
 
                     code.movaps(xmm0, GetVectorOf<fsize, float_upper_limit_signed>(code));
@@ -1836,6 +1834,7 @@ void EmitFPVectorToFixed(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
 
     static const auto lut = Common::GenerateLookupTableFromList(
         []<typename I>(I) {
+            using FPT = mcl::unsigned_integer_of_size<fsize>;  // WORKAROUND: For issue 678 on MSVC
             return std::pair{
                 mp::lower_to_tuple_v<I>,
                 Common::FptrCast(