diff --git a/src/backend_x64/emit_x64.cpp b/src/backend_x64/emit_x64.cpp
index ad71baaf..861cde55 100644
--- a/src/backend_x64/emit_x64.cpp
+++ b/src/backend_x64/emit_x64.cpp
@@ -307,7 +307,11 @@ void EmitX64::EmitCallSupervisor(IR::Block&, IR::Inst* inst) {
 
     reg_alloc.HostCall(nullptr, imm32);
 
+    code->STMXCSR(MDisp(R15, offsetof(JitState, guest_MXCSR)));
+    code->LDMXCSR(MDisp(R15, offsetof(JitState, save_host_MXCSR)));
     code->ABI_CallFunction(reinterpret_cast<void*>(cb.CallSVC));
+    code->STMXCSR(MDisp(R15, offsetof(JitState, save_host_MXCSR)));
+    code->LDMXCSR(MDisp(R15, offsetof(JitState, guest_MXCSR)));
 }
 
 void EmitX64::EmitGetCarryFromOp(IR::Block&, IR::Inst*) {
diff --git a/src/backend_x64/jitstate.cpp b/src/backend_x64/jitstate.cpp
index f7bba4dc..36e90b42 100644
--- a/src/backend_x64/jitstate.cpp
+++ b/src/backend_x64/jitstate.cpp
@@ -90,7 +90,7 @@ void JitState::SetFpscr(u32 FPSCR) {
     guest_MXCSR = 0;
 
     // Exception masks / enables
-    guest_MXCSR |= 0b1111110000000; // mask all
+    guest_MXCSR |= 0x00001f80; // mask all
     //guest_MXCSR |= (~FPSCR >> 1) & 0b0000010000000;  // IM = ~IOE
     //guest_MXCSR |= (~FPSCR >> 7) & 0b0000100000000;  // DM = ~IDE
     //guest_MXCSR |= (~FPSCR     ) & 0b1111000000000;  // PM, UM, OM, ZM = ~IXE, ~UFE, ~OFE, ~DZE
diff --git a/src/backend_x64/jitstate.h b/src/backend_x64/jitstate.h
index 2efb23dd..c4221411 100644
--- a/src/backend_x64/jitstate.h
+++ b/src/backend_x64/jitstate.h
@@ -25,7 +25,7 @@ struct JitState {
     std::array<u64, SpillCount> Spill{}; // Spill.
 
     // For internal use (See: Routines::RunCode)
-    u32 guest_MXCSR = 0;
+    u32 guest_MXCSR = 0x00001f80;
     u32 save_host_MXCSR = 0;
     u64 save_host_RSP = 0;
     s64 cycles_remaining = 0;