diff --git a/include/instructions.h b/include/instructions.h
index 38721d0..b140ad9 100644
--- a/include/instructions.h
+++ b/include/instructions.h
@@ -38,6 +38,7 @@ public:
   void and_eax_imm32(); // 0x25
   void sub_rm32_r32();  // 0x29
   void sub_r32_rm32();  // 0x2b
+  void sub_eax_imm32(); // 0x2d
   void xor_rm32_r32();  // 0x31
   void inc_eax();       // 0x40
   void inc_ecx();       // 0x41
diff --git a/instructions.cpp b/instructions.cpp
index c4c8590..160ed6b 100644
--- a/instructions.cpp
+++ b/instructions.cpp
@@ -31,6 +31,7 @@ void Instructions::init_instructions(){
   this->instructions[0x25] = &Instructions::and_eax_imm32;
   this->instructions[0x29] = &Instructions::sub_rm32_r32;
   this->instructions[0x2b] = &Instructions::sub_r32_rm32;
+  this->instructions[0x2d] = &Instructions::sub_eax_imm32;
   this->instructions[0x31] = &Instructions::xor_rm32_r32;
   this->instructions[0x40] = &Instructions::inc_eax;
   this->instructions[0x41] = &Instructions::inc_ecx;
@@ -524,6 +525,13 @@ void Instructions::sub_r32_rm32(){
   }
 }
 
+void Instructions::sub_eax_imm32(){
+  this->eip++;
+  uint32_t imm32 = memory.read_uint32(this->eip);
+  imm32 = swap_endian32(imm32);
+  this->registers[0] -= imm32;
+}
+
 void Instructions::xor_rm32_r32(){
   //printf("xor_rm32_r32 called.\n");
   uint32_t addr, dst, imm32;