diff --git a/src/dynarmic/src/dynarmic/backend/x64/a32_jitstate.h b/src/dynarmic/src/dynarmic/backend/x64/a32_jitstate.h
index f8de2d91de..c276ab0b8b 100644
--- a/src/dynarmic/src/dynarmic/backend/x64/a32_jitstate.h
+++ b/src/dynarmic/src/dynarmic/backend/x64/a32_jitstate.h
@@ -9,6 +9,7 @@
 #pragma once
 
 #include <array>
+#include <cstddef>
 
 #include "common/common_types.h"
 
@@ -48,8 +49,8 @@ struct A32JitState {
     // Exclusive state
     u32 exclusive_state = 0;
 
-    static constexpr size_t RSBSize = 8;  // MUST be a power of 2.
-    static constexpr size_t RSBPtrMask = RSBSize - 1;
+    static constexpr std::size_t RSBSize = 8;  // MUST be a power of 2.
+    static constexpr std::size_t RSBPtrMask = RSBSize - 1;
     u32 rsb_ptr = 0;
     std::array<u64, RSBSize> rsb_location_descriptors;
     std::array<u64, RSBSize> rsb_codeptrs;
diff --git a/src/dynarmic/src/dynarmic/backend/x64/nzcv_util.h b/src/dynarmic/src/dynarmic/backend/x64/nzcv_util.h
index 01ba9e034e..2abe06e035 100644
--- a/src/dynarmic/src/dynarmic/backend/x64/nzcv_util.h
+++ b/src/dynarmic/src/dynarmic/backend/x64/nzcv_util.h
@@ -9,16 +9,17 @@
 #pragma once
 
 #include "common/common_types.h"
+#include <cstddef>
 
 namespace Dynarmic::Backend::X64::NZCV {
 
 constexpr u32 arm_mask = 0xF000'0000;
 constexpr u32 x64_mask = 0xC101;
 
-constexpr size_t x64_n_flag_bit = 15;
-constexpr size_t x64_z_flag_bit = 14;
-constexpr size_t x64_c_flag_bit = 8;
-constexpr size_t x64_v_flag_bit = 0;
+constexpr std::size_t x64_n_flag_bit = 15;
+constexpr std::size_t x64_z_flag_bit = 14;
+constexpr std::size_t x64_c_flag_bit = 8;
+constexpr std::size_t x64_v_flag_bit = 0;
 
 /// This is a constant used to create the x64 flags format from the ARM format.
 /// NZCV * multiplier: NZCV0NZCV000NZCV
@@ -46,7 +47,7 @@ inline u32 FromX64(u32 x64_flags) {
     nzcv |= mcl::bit::get_bit<15>(x64_flags) ? 1 << 31 : 0;
     nzcv |= mcl::bit::get_bit<14>(x64_flags) ? 1 << 30 : 0;
     nzcv |= mcl::bit::get_bit<8>(x64_flags) ? 1 << 29 : 0;
-    nzcv |= mcl::bit::get_bit<0>(x64_flags) ? 1 << 28 : 0;
+    nzcv |= mcl::bit::get_bit<0>(x64_flaags) ? 1 << 28 : 0;
     return nzcv;
     */
     return ((x64_flags & x64_mask) * from_x64_multiplier) & arm_mask;
diff --git a/src/dynarmic/src/dynarmic/backend/x64/stack_layout.h b/src/dynarmic/src/dynarmic/backend/x64/stack_layout.h
index 804711ad60..b5fd1f04e9 100644
--- a/src/dynarmic/src/dynarmic/backend/x64/stack_layout.h
+++ b/src/dynarmic/src/dynarmic/backend/x64/stack_layout.h
@@ -9,12 +9,13 @@
 #pragma once
 
 #include <array>
+#include <cstddef>
 
 #include "common/common_types.h"
 
 namespace Dynarmic::Backend::X64 {
 
-constexpr size_t SpillCount = 64;
+constexpr std::size_t SpillCount = 64;
 
 #ifdef _MSC_VER
 #    pragma warning(push)