diff --git a/include/instructions.h b/include/instructions.h
index 46768eb..c40799f 100644
--- a/include/instructions.h
+++ b/include/instructions.h
@@ -37,6 +37,7 @@ public:
   void adc_rm32_r32();  // 0x11
   void adc_r32_rm32();  // 0x13
   void adc_eax_imm32(); // 0x15
+  void sbb_rm32_r32();  // 0x19
   void and_rm32_r32();  // 0x21
   void and_r32_rm32();  // 0x23
   void and_eax_imm32(); // 0x25
diff --git a/instructions.cpp b/instructions.cpp
index 11746e6..83a54e3 100644
--- a/instructions.cpp
+++ b/instructions.cpp
@@ -29,6 +29,7 @@ void Instructions::init_instructions(){
   this->instructions[0x11] = &Instructions::adc_rm32_r32;
   this->instructions[0x13] = &Instructions::adc_r32_rm32;
   this->instructions[0x15] = &Instructions::adc_eax_imm32;
+  this->instructions[0x19] = &Instructions::sbb_rm32_r32;
   this->instructions[0x21] = &Instructions::and_rm32_r32;
   this->instructions[0x23] = &Instructions::and_r32_rm32;
   this->instructions[0x25] = &Instructions::and_eax_imm32;
@@ -441,6 +442,56 @@ void Instructions::adc_eax_imm32(){
   this->registers[0] += imm32 + get_flag(CF);
 }
 
+void Instructions::sbb_rm32_r32(){
+  //printf("sbb_rm32_r32 called.\n");
+  uint32_t addr, dst, imm32;
+  uint8_t imm8;
+
+  this->modrm = memory.read_uint8(this->eip);
+  this->calc_modrm();
+
+  switch (this->mod) {
+    case 0:
+      // sbb [M], R
+      // addr : M
+      this->eip++;
+      addr = this->registers[this->M];
+      // dst : data of [M]
+      dst = memory.read_uint32(addr);
+      memory.write_uint32(addr, dst - (this->registers[this->R] + get_flag(CF)));
+      break;
+    case 1:
+      // sbb [M+imm8], R
+      this->eip++;
+      imm8 = memory.read_uint8(this->eip);
+      // addr : M
+      addr = this->registers[this->M];
+      // dst : data of [M+imm8]
+      dst = memory.read_uint32(addr + imm8);
+      memory.write_uint32(addr + imm8, dst - (this->registers[this->R] + get_flag(CF)));
+      this->eip++;
+      break;
+    case 2:
+      // sbb [M+imm32], R
+      this->eip++;
+      imm32 = memory.read_uint32(this->eip);
+      imm32 = swap_endian32(imm32);
+      // addr : M
+      addr = this->registers[this->M];
+      // dst : data of [M+imm32]
+      dst = memory.read_uint32(addr + imm32);
+      memory.write_uint32(addr, dst - (this->registers[this->R] + get_flag(CF)));
+      this->eip += 4;
+      break;
+    default:
+      // case mod == 3
+      // sbb M, R
+      this->eip++;
+      this->registers[this->M] -= this->registers[this->R] + get_flag(CF);
+      break;
+  }
+}
+
 void Instructions::and_rm32_r32(){
   //printf("and_rm32_r32 called.\n");
   uint32_t addr, dst, imm32;