diff --git a/Userland/Libraries/LibJIT/X86_64/Assembler.h b/Userland/Libraries/LibJIT/X86_64/Assembler.h
index 15ed60afe78..a0cc5c69150 100644
--- a/Userland/Libraries/LibJIT/X86_64/Assembler.h
+++ b/Userland/Libraries/LibJIT/X86_64/Assembler.h
@@ -757,6 +757,21 @@ struct X86_64Assembler {
         }
     }
 
+    void dec32(Operand op, Optional<Label&> overflow_label)
+    {
+        if (op.is_register_or_memory()) {
+            emit_rex_for_slash(op, REX_W::No);
+            emit8(0xff);
+            emit_modrm_slash(1, op);
+        } else {
+            VERIFY_NOT_REACHED();
+        }
+
+        if (overflow_label.has_value()) {
+            jump_if(Condition::Overflow, *overflow_label);
+        }
+    }
+
     void add(Operand dst, Operand src)
     {
         if (dst.is_register_or_memory() && src.type == Operand::Type::Reg) {
diff --git a/Userland/Libraries/LibJS/JIT/Compiler.cpp b/Userland/Libraries/LibJS/JIT/Compiler.cpp
index 2d419b4da45..59416c1ebb6 100644
--- a/Userland/Libraries/LibJS/JIT/Compiler.cpp
+++ b/Userland/Libraries/LibJS/JIT/Compiler.cpp
@@ -396,9 +396,41 @@ static Value cxx_decrement(VM& vm, Value value)
 void Compiler::compile_decrement(Bytecode::Op::Decrement const&)
 {
     load_accumulator(ARG1);
+
+    Assembler::Label end {};
+    Assembler::Label slow_case {};
+
+    branch_if_int32(ARG1, [&] {
+        // GPR0 = ARG1;
+        m_assembler.mov(
+            Assembler::Operand::Register(GPR0),
+            Assembler::Operand::Register(ARG1));
+
+        // GPR0--;
+        m_assembler.dec32(
+            Assembler::Operand::Register(GPR0),
+            slow_case);
+
+        // accumulator = GPR0 | SHIFTED_INT32_TAG;
+        m_assembler.mov(
+            Assembler::Operand::Register(GPR1),
+            Assembler::Operand::Imm(SHIFTED_INT32_TAG));
+        m_assembler.bitwise_or(
+            Assembler::Operand::Register(GPR0),
+            Assembler::Operand::Register(GPR1));
+
+        // accumulator = GPR0;
+        store_accumulator(GPR0);
+
+        m_assembler.jump(end);
+    });
+
+    slow_case.link(m_assembler);
     native_call((void*)cxx_decrement);
     store_accumulator(RET);
     check_exception();
+
+    end.link(m_assembler);
 }
 
 void Compiler::check_exception()