diff --git a/src/backend/core/interpreter/decode.cpp b/src/backend/core/interpreter/decode.cpp
index b131f97..4ebe67f 100644
--- a/src/backend/core/interpreter/decode.cpp
+++ b/src/backend/core/interpreter/decode.cpp
@@ -414,12 +414,16 @@ void Interpreter::Exec(const Instruction instr) {
     ll(instr);
     break;
   case Instruction::LWC1:
+    if (!regs.cop1.CheckFPUUsable())
+      return;
     regs.cop1.lwc1(instr);
     break;
   case Instruction::LLD:
     lld(instr);
     break;
   case Instruction::LDC1:
+    if (!regs.cop1.CheckFPUUsable())
+      return;
     regs.cop1.ldc1(instr);
     break;
   case Instruction::LD:
@@ -429,12 +433,16 @@ void Interpreter::Exec(const Instruction instr) {
     sc(instr);
     break;
   case Instruction::SWC1:
+    if (!regs.cop1.CheckFPUUsable())
+      return;
     regs.cop1.swc1(instr);
     break;
   case Instruction::SCD:
     scd(instr);
     break;
   case Instruction::SDC1:
+    if (!regs.cop1.CheckFPUUsable())
+      return;
     regs.cop1.sdc1(instr);
     break;
   case Instruction::SD: